1420440 has 128 divisors (see below), whose sum is σ = 5184000. Its totient is φ = 304128.

The previous prime is 1420429. The next prime is 1420483. The reversal of 1420440 is 440241.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15916 + ... + 16004.

It is an arithmetic number, because the mean of its divisors is an integer number (40500).

2^1420440 is an apocalyptic number.

1420440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1420440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2592000).

1420440 is an abundant number, since it is smaller than the sum of its proper divisors (3763560).

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

1420440 is a wasteful number, since it uses less digits than its factorization.

1420440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1420440 is about 1191.8221343808. The cubic root of 1420440 is about 112.4106945579.

Adding to 1420440 its sum of digits (15), we get a triangular number (1420455 = T₁₆₈₅).

Adding to 1420440 its reverse (440241), we get a palindrome (1860681).

The spelling of 1420440 in words is "one million, four hundred twenty thousand, four hundred forty".