2156238456 has 32 divisors (see below), whose sum is σ = 5391867600. Its totient is φ = 718576640.

The previous prime is 2156238443. The next prime is 2156238467. The reversal of 2156238456 is 6548326512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133000 + ... + 148328.

Almost surely, 2^2156238456 is an apocalyptic number.

It is an amenable number.

2156238456 is an abundant number, since it is smaller than the sum of its proper divisors (3235629144).

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

2156238456 is a wasteful number, since it uses less digits than its factorization.

2156238456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21199 (or 21195 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The square root of 2156238456 is about 46435.3147507369. The cubic root of 2156238456 is about 1291.9100075663.

The spelling of 2156238456 in words is "two billion, one hundred fifty-six million, two hundred thirty-eight thousand, four hundred fifty-six".