520173739 has 4 divisors (see below), whose sum is σ = 521868424. Its totient is φ = 518479056.

The previous prime is 520173737. The next prime is 520173743. The reversal of 520173739 is 937371025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520173739 - 2¹ = 520173737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520173698 and 520173707.

It is not an unprimeable number, because it can be changed into a prime (520173733) 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, 846882 + ... + 847495.

It is an arithmetic number, because the mean of its divisors is an integer number (130467106).

Almost surely, 2^520173739 is an apocalyptic number.

520173739 is a deficient number, since it is larger than the sum of its proper divisors (1694685).

520173739 is a wasteful number, since it uses less digits than its factorization.

520173739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694684.

The product of its (nonzero) digits is 39690, while the sum is 37.

The square root of 520173739 is about 22807.3176634167. The cubic root of 520173739 is about 804.2347003188.

The spelling of 520173739 in words is "five hundred twenty million, one hundred seventy-three thousand, seven hundred thirty-nine".