51389232 has 80 divisors (see below), whose sum is σ = 142705152. Its totient is φ = 15877120.

The previous prime is 51389231. The next prime is 51389251. The reversal of 51389232 is 23298315.

It is a junction number, because it is equal to n+sod(n) for n = 51389193 and 51389202.

It is not an unprimeable number, because it can be changed into a prime (51389231) 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, 57493 + ... + 58379.

Almost surely, 2^51389232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51389232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71352576).

51389232 is an abundant number, since it is smaller than the sum of its proper divisors (91315920).

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

51389232 is a wasteful number, since it uses less digits than its factorization.

51389232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 980 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 51389232 is about 7168.6283206761. The cubic root of 51389232 is about 371.7840115127.

The spelling of 51389232 in words is "fifty-one million, three hundred eighty-nine thousand, two hundred thirty-two".