51398538 has 16 divisors (see below), whose sum is σ = 102868896. Its totient is φ = 17120880.

The previous prime is 51398521. The next prime is 51398549. The reversal of 51398538 is 83589315.

It is a self number, because there is not a number n which added to its sum of digits gives 51398538.

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, 12420 + ... + 16032.

It is an arithmetic number, because the mean of its divisors is an integer number (6429306).

Almost surely, 2^51398538 is an apocalyptic number.

51398538 is an abundant number, since it is smaller than the sum of its proper divisors (51470358).

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

51398538 is a wasteful number, since it uses less digits than its factorization.

51398538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5989.

The product of its digits is 129600, while the sum is 42.

The square root of 51398538 is about 7169.2773694425. The cubic root of 51398538 is about 371.8064520971.

The spelling of 51398538 in words is "fifty-one million, three hundred ninety-eight thousand, five hundred thirty-eight".