172139958 has 32 divisors (see below), whose sum is σ = 399168000. Its totient is φ = 54884808.

The previous prime is 172139939. The next prime is 172139959. The reversal of 172139958 is 859931271.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172139959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68058 + ... + 70541.

It is an arithmetic number, because the mean of its divisors is an integer number (12474000).

Almost surely, 2^172139958 is an apocalyptic number.

172139958 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

172139958 is an abundant number, since it is smaller than the sum of its proper divisors (227028042).

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

172139958 is a wasteful number, since it uses less digits than its factorization.

172139958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138633 (or 138627 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 172139958 is about 13120.2118123146. The cubic root of 172139958 is about 556.2805784141.

The spelling of 172139958 in words is "one hundred seventy-two million, one hundred thirty-nine thousand, nine hundred fifty-eight".