51156396 has 18 divisors (see below), whose sum is σ = 129312092. Its totient is φ = 17052120.

The previous prime is 51156361. The next prime is 51156403. The reversal of 51156396 is 69365115.

51156396 is a `hidden beast` number, since 5 + 1 + 1 + 563 + 96 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1421011 = 51156396 / (5 + 1 + 1 + 5 + 6 + 3 + 9 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 51156396.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 710470 + ... + 710541.

Almost surely, 2^51156396 is an apocalyptic number.

It is an amenable number.

51156396 is an abundant number, since it is smaller than the sum of its proper divisors (78155696).

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

51156396 is a wasteful number, since it uses less digits than its factorization.

51156396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421021 (or 1421016 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 51156396 is about 7152.3699568744. The cubic root of 51156396 is about 371.2216643340.

It can be divided in two parts, 5115 and 6396, that added together give a palindrome (11511).

The spelling of 51156396 in words is "fifty-one million, one hundred fifty-six thousand, three hundred ninety-six".