520856973 has 40 divisors (see below), whose sum is σ = 957638528. Its totient is φ = 274733856.

The previous prime is 520856957. The next prime is 520856977. The reversal of 520856973 is 379658025.

It is a happy number.

520856973 is a `hidden beast` number, since 520 + 8 + 56 + 9 + 73 = 666.

It is not a de Polignac number, because 520856973 - 2⁴ = 520856957 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520856977) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 27961 + ... + 42702.

Almost surely, 2^520856973 is an apocalyptic number.

It is an amenable number.

520856973 is a deficient number, since it is larger than the sum of its proper divisors (436781555).

520856973 is a wasteful number, since it uses less digits than its factorization.

520856973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70695 (or 70686 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 520856973 is about 22822.2911426526. The cubic root of 520856973 is about 804.5866597057.

The spelling of 520856973 in words is "five hundred twenty million, eight hundred fifty-six thousand, nine hundred seventy-three".