172981376 has 16 divisors (see below), whose sum is σ = 344611590. Its totient is φ = 86490624.

The previous prime is 172981373. The next prime is 172981381. The reversal of 172981376 is 673189271.

It can be written as a sum of positive squares in only one way, i.e., 164454976 + 8526400 = 12824^2 + 2920^2 .

It is a tau number, because it is divible by the number of its divisors (16).

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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675581 + ... + 675836.

Almost surely, 2^172981376 is an apocalyptic number.

172981376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172981376 is a deficient number, since it is larger than the sum of its proper divisors (171630214).

172981376 is an equidigital number, since it uses as much as digits as its factorization.

172981376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351431 (or 1351419 counting only the distinct ones).

The product of its digits is 127008, while the sum is 44.

The square root of 172981376 is about 13152.2384406610. The cubic root of 172981376 is about 557.1854698568.

The spelling of 172981376 in words is "one hundred seventy-two million, nine hundred eighty-one thousand, three hundred seventy-six".