521240406 has 8 divisors (see below), whose sum is σ = 1042480824. Its totient is φ = 173746800.

The previous prime is 521240389. The next prime is 521240407. The reversal of 521240406 is 604042125.

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

521240406 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521240407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43436695 + ... + 43436706.

It is an arithmetic number, because the mean of its divisors is an integer number (130310103).

Almost surely, 2^521240406 is an apocalyptic number.

521240406 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.

521240406 is a wasteful number, since it uses less digits than its factorization.

521240406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86873406.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 521240406 is about 22830.6900027135. The cubic root of 521240406 is about 804.7840455658.

The spelling of 521240406 in words is "five hundred twenty-one million, two hundred forty thousand, four hundred six".