520840992 has 144 divisors (see below), whose sum is σ = 1600264512. Its totient is φ = 147893760.

The previous prime is 520840987. The next prime is 520840993. The reversal of 520840992 is 299048025.

It is a self number, because there is not a number n which added to its sum of digits gives 520840992.

It is not an unprimeable number, because it can be changed into a prime (520840993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1236942 + ... + 1237362.

It is an arithmetic number, because the mean of its divisors is an integer number (11112948).

Almost surely, 2^520840992 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 520840992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800132256).

520840992 is an abundant number, since it is smaller than the sum of its proper divisors (1079423520).

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

520840992 is a wasteful number, since it uses less digits than its factorization.

520840992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 696 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 520840992 is about 22821.9410217448. The cubic root of 520840992 is about 804.5784308114.

The spelling of 520840992 in words is "five hundred twenty million, eight hundred forty thousand, nine hundred ninety-two".