51253940 has 24 divisors (see below), whose sum is σ = 107823912. Its totient is φ = 20465280.

The previous prime is 51253919. The next prime is 51253973. The reversal of 51253940 is 4935215.

It can be written as a sum of positive squares in 4 ways, for example, as 6041764 + 45212176 = 2458^2 + 6724^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 11282 + ... + 15158.

It is an arithmetic number, because the mean of its divisors is an integer number (4492663).

Almost surely, 2^51253940 is an apocalyptic number.

It is an amenable number.

51253940 is an abundant number, since it is smaller than the sum of its proper divisors (56569972).

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

51253940 is a wasteful number, since it uses less digits than its factorization.

51253940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4547 (or 4545 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 51253940 is about 7159.1857078861. The cubic root of 51253940 is about 371.4574605594.

The spelling of 51253940 in words is "fifty-one million, two hundred fifty-three thousand, nine hundred forty".