509438646 has 40 divisors (see below), whose sum is σ = 1143206064. Its totient is φ = 169562160.

The previous prime is 509438623. The next prime is 509438701. The reversal of 509438646 is 646834905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 131416 + ... + 135236.

Almost surely, 2^509438646 is an apocalyptic number.

509438646 is an abundant number, since it is smaller than the sum of its proper divisors (633767418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

509438646 is a wasteful number, since it uses less digits than its factorization.

509438646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4658 (or 4649 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 509438646 is about 22570.7475729095. The cubic root of 509438646 is about 798.6637306815.

The spelling of 509438646 in words is "five hundred nine million, four hundred thirty-eight thousand, six hundred forty-six".