520442723 has 4 divisors (see below), whose sum is σ = 521572128. Its totient is φ = 519313320.

The previous prime is 520442701. The next prime is 520442749. The reversal of 520442723 is 327244025.

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 520442723 - 2¹⁰ = 520441699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520442023) 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, 564011 + ... + 564932.

It is an arithmetic number, because the mean of its divisors is an integer number (130393032).

Almost surely, 2^520442723 is an apocalyptic number.

520442723 is a deficient number, since it is larger than the sum of its proper divisors (1129405).

520442723 is a wasteful number, since it uses less digits than its factorization.

520442723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129404.

The product of its (nonzero) digits is 13440, while the sum is 29.

The square root of 520442723 is about 22813.2137806141. The cubic root of 520442723 is about 804.3733007987.

Adding to 520442723 its reverse (327244025), we get a palindrome (847686748).

The spelling of 520442723 in words is "five hundred twenty million, four hundred forty-two thousand, seven hundred twenty-three".