509942172 has 12 divisors (see below), whose sum is σ = 1189865096. Its totient is φ = 169980720.

The previous prime is 509942161. The next prime is 509942179. The reversal of 509942172 is 271249905.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 509942172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509942179) 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, 21247579 + ... + 21247602.

Almost surely, 2^509942172 is an apocalyptic number.

It is an amenable number.

509942172 is an abundant number, since it is smaller than the sum of its proper divisors (679922924).

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

509942172 is a wasteful number, since it uses less digits than its factorization.

509942172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42495188 (or 42495186 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 509942172 is about 22581.8992115367. The cubic root of 509942172 is about 798.9267754635.

The spelling of 509942172 in words is "five hundred nine million, nine hundred forty-two thousand, one hundred seventy-two".