51397504 has 32 divisors (see below), whose sum is σ = 105704640. Its totient is φ = 24867840.

The previous prime is 51397481. The next prime is 51397517. The reversal of 51397504 is 40579315.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 51397504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2509 + ... + 10444.

It is an arithmetic number, because the mean of its divisors is an integer number (3303270).

Almost surely, 2^51397504 is an apocalyptic number.

It is an amenable number.

51397504 is an abundant number, since it is smaller than the sum of its proper divisors (54307136).

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

51397504 is a wasteful number, since it uses less digits than its factorization.

51397504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12998 (or 12986 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 51397504 is about 7169.2052558146. The cubic root of 51397504 is about 371.8039588326.

The spelling of 51397504 in words is "fifty-one million, three hundred ninety-seven thousand, five hundred four".