51402036 has 48 divisors (see below), whose sum is σ = 141805440. Its totient is φ = 14179200.

The previous prime is 51402019. The next prime is 51402037. The reversal of 51402036 is 63020415.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51402037) 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, 8115 + ... + 12986.

It is an arithmetic number, because the mean of its divisors is an integer number (2954280).

Almost surely, 2^51402036 is an apocalyptic number.

It is an amenable number.

51402036 is an abundant number, since it is smaller than the sum of its proper divisors (90403404).

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

51402036 is a wasteful number, since it uses less digits than its factorization.

51402036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21144 (or 21142 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 51402036 is about 7169.5213229336. The cubic root of 51402036 is about 371.8148865099.

It can be divided in two parts, 5 and 1402036, that added together give a palindrome (1402041).

The spelling of 51402036 in words is "fifty-one million, four hundred two thousand, thirty-six".