51396138 has 24 divisors (see below), whose sum is σ = 112240128. Its totient is φ = 16996392.

The previous prime is 51396133. The next prime is 51396179. The reversal of 51396138 is 83169315.

It is a happy number.

51396138 is a `hidden beast` number, since 5 + 1 + 39 + 613 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (51396133) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 8956 + ... + 13527.

It is an arithmetic number, because the mean of its divisors is an integer number (4676672).

Almost surely, 2^51396138 is an apocalyptic number.

51396138 is an abundant number, since it is smaller than the sum of its proper divisors (60843990).

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

51396138 is a wasteful number, since it uses less digits than its factorization.

51396138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22618 (or 22615 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 51396138 is about 7169.1099866022. The cubic root of 51396138 is about 371.8006649716.

The spelling of 51396138 in words is "fifty-one million, three hundred ninety-six thousand, one hundred thirty-eight".