51359940 has 48 divisors (see below), whose sum is σ = 159788160. Its totient is φ = 13695840.

The previous prime is 51359939. The next prime is 51359947. The reversal of 51359940 is 4995315.

51359940 is a `hidden beast` number, since 513 + 59 + 94 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51359895 and 51359904.

It is not an unprimeable number, because it can be changed into a prime (51359947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47016 + ... + 48095.

It is an arithmetic number, because the mean of its divisors is an integer number (3328920).

Almost surely, 2^51359940 is an apocalyptic number.

It is an amenable number.

51359940 is an abundant number, since it is smaller than the sum of its proper divisors (108428220).

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

51359940 is a wasteful number, since it uses less digits than its factorization.

51359940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95129 (or 95121 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 51359940 is about 7166.5849607746. The cubic root of 51359940 is about 371.7133587925.

The spelling of 51359940 in words is "fifty-one million, three hundred fifty-nine thousand, nine hundred forty".