2157456 has 40 divisors (see below), whose sum is σ = 6370624. Its totient is φ = 616320.

The previous prime is 2157451. The next prime is 2157457. The reversal of 2157456 is 6547512.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2157451) 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, 2875 + ... + 3546.

2^2157456 is an apocalyptic number.

It is an amenable number.

2157456 is an abundant number, since it is smaller than the sum of its proper divisors (4213168).

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

2157456 is a wasteful number, since it uses less digits than its factorization.

2157456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6439 (or 6433 counting only the distinct ones).

The product of its digits is 8400, while the sum is 30.

The square root of 2157456 is about 1468.8281043063. The cubic root of 2157456 is about 129.2153125592.

The spelling of 2157456 in words is "two million, one hundred fifty-seven thousand, four hundred fifty-six".