520395978 has 16 divisors (see below), whose sum is σ = 1095570720. Its totient is φ = 164335536.

The previous prime is 520395961. The next prime is 520396013. The reversal of 520395978 is 879593025.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2282325 + ... + 2282552.

It is an arithmetic number, because the mean of its divisors is an integer number (68473170).

Almost surely, 2^520395978 is an apocalyptic number.

520395978 is an abundant number, since it is smaller than the sum of its proper divisors (575174742).

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

520395978 is a wasteful number, since it uses less digits than its factorization.

520395978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4564901.

The product of its (nonzero) digits is 680400, while the sum is 48.

The square root of 520395978 is about 22812.1892417190. The cubic root of 520395978 is about 804.3492177415.

The spelling of 520395978 in words is "five hundred twenty million, three hundred ninety-five thousand, nine hundred seventy-eight".