509139404 has 24 divisors (see below), whose sum is σ = 899180688. Its totient is φ = 252241920.

The previous prime is 509139401. The next prime is 509139427. The reversal of 509139404 is 404931905.

It is not an unprimeable number, because it can be changed into a prime (509139401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215759 + ... + 218105.

It is an arithmetic number, because the mean of its divisors is an integer number (37465862).

Almost surely, 2^509139404 is an apocalyptic number.

It is an amenable number.

509139404 is a deficient number, since it is larger than the sum of its proper divisors (390041284).

509139404 is a wasteful number, since it uses less digits than its factorization.

509139404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825 (or 2823 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 509139404 is about 22564.1176206826. The cubic root of 509139404 is about 798.5073228759.

The spelling of 509139404 in words is "five hundred nine million, one hundred thirty-nine thousand, four hundred four".