1401138 has 42 divisors (see below), whose sum is σ = 3256047. Its totient is φ = 451980.

The previous prime is 1401131. The next prime is 1401139. The reversal of 1401138 is 8311041.

It can be written as a sum of positive squares in only one way, i.e., 700569 + 700569 = 837^2 + 837^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=837.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1401138.

It is not an unprimeable number, because it can be changed into a prime (1401131) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 45183 + ... + 45213.

2^1401138 is an apocalyptic number.

1401138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1401138

1401138 is an abundant number, since it is smaller than the sum of its proper divisors (1854909).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1401138 is an frugal number, since it uses more digits than its factorization.

1401138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1401138 is about 1183.6967517063. The cubic root of 1401138 is about 111.8991971422.

Multiplying 1401138 by its sum of digits (18), we get a square (25220484 = 5022²).

1401138 divided by its sum of digits (18) gives a square (77841 = 279²).

Adding to 1401138 its reverse (8311041), we get a palindrome (9712179).

Subtracting 1401138 from its reverse (8311041), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1401138 in words is "one million, four hundred one thousand, one hundred thirty-eight".