520556399 has 12 divisors (see below), whose sum is σ = 574173768. Its totient is φ = 471585840.

The previous prime is 520556389. The next prime is 520556429. The reversal of 520556399 is 993655025.

It is not a de Polignac number, because 520556399 - 2¹² = 520552303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520556389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28112 + ... + 42794.

It is an arithmetic number, because the mean of its divisors is an integer number (47847814).

Almost surely, 2^520556399 is an apocalyptic number.

520556399 is a deficient number, since it is larger than the sum of its proper divisors (53617369).

520556399 is a wasteful number, since it uses less digits than its factorization.

520556399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14998 (or 14987 counting only the distinct ones).

The product of its (nonzero) digits is 364500, while the sum is 44.

The square root of 520556399 is about 22815.7050953943. The cubic root of 520556399 is about 804.4318607380.

The spelling of 520556399 in words is "five hundred twenty million, five hundred fifty-six thousand, three hundred ninety-nine".