520838409 has 32 divisors (see below), whose sum is σ = 882294784. Its totient is φ = 265861440.

The previous prime is 520838399. The next prime is 520838447. The reversal of 520838409 is 904838025.

It is a happy number.

It is not a de Polignac number, because 520838409 - 2⁵ = 520838377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (520838209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22309 + ... + 39234.

It is an arithmetic number, because the mean of its divisors is an integer number (27571712).

Almost surely, 2^520838409 is an apocalyptic number.

It is an amenable number.

520838409 is a deficient number, since it is larger than the sum of its proper divisors (361456375).

520838409 is a wasteful number, since it uses less digits than its factorization.

520838409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61597.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 520838409 is about 22821.8844313961. The cubic root of 520838409 is about 804.5771007641.

The spelling of 520838409 in words is "five hundred twenty million, eight hundred thirty-eight thousand, four hundred nine".