2156357238 has 16 divisors (see below), whose sum is σ = 4928816640. Its totient is φ = 616102056.

The previous prime is 2156357209. The next prime is 2156357261. The reversal of 2156357238 is 8327536512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 51341839 = 2156357238 / (2 + 1 + 5 + 6 + 3 + 5 + 7 + 2 + 3 + 8).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156357238.

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, 25670878 + ... + 25670961.

It is an arithmetic number, because the mean of its divisors is an integer number (308051040).

Almost surely, 2^2156357238 is an apocalyptic number.

2156357238 is an abundant number, since it is smaller than the sum of its proper divisors (2772459402).

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

2156357238 is a wasteful number, since it uses less digits than its factorization.

2156357238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51341851.

The product of its digits is 302400, while the sum is 42.

The square root of 2156357238 is about 46436.5937381286. The cubic root of 2156357238 is about 1291.9337298710.

The spelling of 2156357238 in words is "two billion, one hundred fifty-six million, three hundred fifty-seven thousand, two hundred thirty-eight".