172920393 has 16 divisors (see below), whose sum is σ = 258139200. Its totient is φ = 114397920.

The previous prime is 172920389. The next prime is 172920401. The reversal of 172920393 is 393029271.

It is not a de Polignac number, because 172920393 - 2² = 172920389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172920323) 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, 20908 + ... + 27981.

It is an arithmetic number, because the mean of its divisors is an integer number (16133700).

Almost surely, 2^172920393 is an apocalyptic number.

It is an amenable number.

172920393 is a deficient number, since it is larger than the sum of its proper divisors (85218807).

172920393 is a wasteful number, since it uses less digits than its factorization.

172920393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49029 (or 49023 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 172920393 is about 13149.9198856875. The cubic root of 172920393 is about 557.1199852825.

It can be divided in two parts, 1729 and 20393, that added together give a palindrome (22122).

The spelling of 172920393 in words is "one hundred seventy-two million, nine hundred twenty thousand, three hundred ninety-three".