51339384 has 48 divisors (see below), whose sum is σ = 140496720. Its totient is φ = 16934400.

The previous prime is 51339373. The next prime is 51339391. The reversal of 51339384 is 48393315.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3309 + ... + 10659.

It is an arithmetic number, because the mean of its divisors is an integer number (2927015).

Almost surely, 2^51339384 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 51339384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70248360).

51339384 is an abundant number, since it is smaller than the sum of its proper divisors (89157336).

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

51339384 is a wasteful number, since it uses less digits than its factorization.

51339384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7460 (or 7453 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 51339384 is about 7165.1506613609. The cubic root of 51339384 is about 371.6637613863.

The spelling of 51339384 in words is "fifty-one million, three hundred thirty-nine thousand, three hundred eighty-four".