172239642 has 32 divisors (see below), whose sum is σ = 395956800. Its totient is φ = 55432944.

The previous prime is 172239629. The next prime is 172239659. The reversal of 172239642 is 246932271.

172239642 is a `hidden beast` number, since 1 + 7 + 2 + 2 + 3 + 9 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 172239597 and 172239606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53428 + ... + 56559.

It is an arithmetic number, because the mean of its divisors is an integer number (12373650).

Almost surely, 2^172239642 is an apocalyptic number.

172239642 is an abundant number, since it is smaller than the sum of its proper divisors (223717158).

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

172239642 is a wasteful number, since it uses less digits than its factorization.

172239642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110027 (or 110021 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 172239642 is about 13124.0101341015. The cubic root of 172239642 is about 556.3879359647.

The spelling of 172239642 in words is "one hundred seventy-two million, two hundred thirty-nine thousand, six hundred forty-two".