51307940 has 24 divisors (see below), whose sum is σ = 112432320. Its totient is φ = 19630688.

The previous prime is 51307903. The next prime is 51307943. The reversal of 51307940 is 4970315.

51307940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51307943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55310 + ... + 56229.

It is an arithmetic number, because the mean of its divisors is an integer number (4684680).

Almost surely, 2^51307940 is an apocalyptic number.

It is an amenable number.

51307940 is an abundant number, since it is smaller than the sum of its proper divisors (61124380).

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

51307940 is a wasteful number, since it uses less digits than its factorization.

51307940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111571 (or 111569 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 51307940 is about 7162.9560936809. The cubic root of 51307940 is about 371.5878678512.

The spelling of 51307940 in words is "fifty-one million, three hundred seven thousand, nine hundred forty".