521307942 has 8 divisors (see below), whose sum is σ = 1042615896. Its totient is φ = 173769312.

The previous prime is 521307923. The next prime is 521307953. The reversal of 521307942 is 249703125.

It is a sphenic number, since it is the product of 3 distinct primes.

521307942 is an admirable number.

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, 43442323 + ... + 43442334.

It is an arithmetic number, because the mean of its divisors is an integer number (130326987).

Almost surely, 2^521307942 is an apocalyptic number.

521307942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

521307942 is a wasteful number, since it uses less digits than its factorization.

521307942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86884662.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 521307942 is about 22832.1690165433. The cubic root of 521307942 is about 804.8188021116.

The spelling of 521307942 in words is "five hundred twenty-one million, three hundred seven thousand, nine hundred forty-two".