1381020 has 24 divisors (see below), whose sum is σ = 3867024. Its totient is φ = 368256.

The previous prime is 1380997. The next prime is 1381027. The reversal of 1381020 is 201831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11449 + ... + 11568.

It is an arithmetic number, because the mean of its divisors is an integer number (161126).

2^1381020 is an apocalyptic number.

1381020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381020 is an abundant number, since it is smaller than the sum of its proper divisors (2486004).

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

1381020 is a wasteful number, since it uses less digits than its factorization.

1381020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23029 (or 23027 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1381020 is about 1175.1680730857. The cubic root of 1381020 is about 111.3610514211.

Adding to 1381020 its reverse (201831), we get a palindrome (1582851).

The spelling of 1381020 in words is "one million, three hundred eighty-one thousand, twenty".