51397908 has 24 divisors (see below), whose sum is σ = 120260448. Its totient is φ = 17085216.

The previous prime is 51397903. The next prime is 51397933. The reversal of 51397908 is 80979315.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51397908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51397901) 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, 1266 + ... + 10217.

It is an arithmetic number, because the mean of its divisors is an integer number (5010852).

Almost surely, 2^51397908 is an apocalyptic number.

It is an amenable number.

51397908 is an abundant number, since it is smaller than the sum of its proper divisors (68862540).

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

51397908 is a wasteful number, since it uses less digits than its factorization.

51397908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11863 (or 11861 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 51397908 is about 7169.2334318252. The cubic root of 51397908 is about 371.8049329941.

The spelling of 51397908 in words is "fifty-one million, three hundred ninety-seven thousand, nine hundred eight".