51399856 has 20 divisors (see below), whose sum is σ = 101277000. Its totient is φ = 25263872.

The previous prime is 51399851. The next prime is 51399863. The reversal of 51399856 is 65899315.

It is not an unprimeable number, because it can be changed into a prime (51399851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26281 + ... + 28168.

It is an arithmetic number, because the mean of its divisors is an integer number (5063850).

Almost surely, 2^51399856 is an apocalyptic number.

It is an amenable number.

51399856 is a deficient number, since it is larger than the sum of its proper divisors (49877144).

51399856 is a wasteful number, since it uses less digits than its factorization.

51399856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54516 (or 54510 counting only the distinct ones).

The product of its digits is 291600, while the sum is 46.

The square root of 51399856 is about 7169.3692888566. The cubic root of 51399856 is about 371.8096301169.

The spelling of 51399856 in words is "fifty-one million, three hundred ninety-nine thousand, eight hundred fifty-six".