51401538 has 24 divisors (see below), whose sum is σ = 111960576. Its totient is φ = 17043000.

The previous prime is 51401533. The next prime is 51401611. The reversal of 51401538 is 83510415.

It is not an unprimeable number, because it can be changed into a prime (51401533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4038 + ... + 10913.

It is an arithmetic number, because the mean of its divisors is an integer number (4665024).

Almost surely, 2^51401538 is an apocalyptic number.

51401538 is an abundant number, since it is smaller than the sum of its proper divisors (60559038).

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

51401538 is a wasteful number, since it uses less digits than its factorization.

51401538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15150 (or 15147 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 51401538 is about 7169.4865924974. The cubic root of 51401538 is about 371.8136857507.

The spelling of 51401538 in words is "fifty-one million, four hundred one thousand, five hundred thirty-eight".