51808842 has 32 divisors (see below), whose sum is σ = 116760960. Its totient is φ = 17025120.

The previous prime is 51808817. The next prime is 51808853. The reversal of 51808842 is 24880815.

It is a super-2 number, since 2×51808842² = 5368312218761928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51808797 and 51808806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2923 + ... + 10590.

It is an arithmetic number, because the mean of its divisors is an integer number (3648780).

Almost surely, 2^51808842 is an apocalyptic number.

51808842 is an abundant number, since it is smaller than the sum of its proper divisors (64952118).

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

51808842 is a wasteful number, since it uses less digits than its factorization.

51808842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13595 (or 13589 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 51808842 is about 7197.8359247763. The cubic root of 51808842 is about 372.7931826948.

It can be divided in two parts, 51808 and 842, that added together give a triangular number (52650 = T₃₂₄).

The spelling of 51808842 in words is "fifty-one million, eight hundred eight thousand, eight hundred forty-two".