51393984 has 28 divisors (see below), whose sum is σ = 135980424. Its totient is φ = 17131264.

The previous prime is 51393977. The next prime is 51394027. The reversal of 51393984 is 48939315.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133647 + ... + 134030.

Almost surely, 2^51393984 is an apocalyptic number.

It is an amenable number.

51393984 is an abundant number, since it is smaller than the sum of its proper divisors (84586440).

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

51393984 is a wasteful number, since it uses less digits than its factorization.

51393984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267692 (or 267682 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 51393984 is about 7168.9597571754. The cubic root of 51393984 is about 371.7954708730.

The spelling of 51393984 in words is "fifty-one million, three hundred ninety-three thousand, nine hundred eighty-four".