172981372 has 12 divisors (see below), whose sum is σ = 304723216. Its totient is φ = 85917600.

The previous prime is 172981349. The next prime is 172981373. The reversal of 172981372 is 273189271.

It is a happy number.

It is a hoax number, since the sum of its digits (40) 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 (172981373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142593 + ... + 143800.

Almost surely, 2^172981372 is an apocalyptic number.

It is an amenable number.

172981372 is a deficient number, since it is larger than the sum of its proper divisors (131741844).

172981372 is a wasteful number, since it uses less digits than its factorization.

172981372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286548 (or 286546 counting only the distinct ones).

The product of its digits is 42336, while the sum is 40.

The square root of 172981372 is about 13152.2382885956. The cubic root of 172981372 is about 557.1854655620.

The spelling of 172981372 in words is "one hundred seventy-two million, nine hundred eighty-one thousand, three hundred seventy-two".