51812340 has 24 divisors (see below), whose sum is σ = 145074720. Its totient is φ = 13816608.

The previous prime is 51812339. The next prime is 51812351. The reversal of 51812340 is 4321815.

It is a self number, because there is not a number n which added to its sum of digits gives 51812340.

It is a congruent number.

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, 431710 + ... + 431829.

It is an arithmetic number, because the mean of its divisors is an integer number (6044780).

Almost surely, 2^51812340 is an apocalyptic number.

It is an amenable number.

51812340 is an abundant number, since it is smaller than the sum of its proper divisors (93262380).

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

51812340 is a wasteful number, since it uses less digits than its factorization.

51812340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863551 (or 863549 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 51812340 is about 7198.0789103760. The cubic root of 51812340 is about 372.8015725188.

The spelling of 51812340 in words is "fifty-one million, eight hundred twelve thousand, three hundred forty".