172388933 has 6 divisors (see below), whose sum is σ = 180210534. Its totient is φ = 164893256.

The previous prime is 172388929. The next prime is 172388939. The reversal of 172388933 is 339883271.

It can be written as a sum of positive squares in only one way, i.e., 171269569 + 1119364 = 13087^2 + 1058^2 .

It is not a de Polignac number, because 172388933 - 2² = 172388929 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172388939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 162410 + ... + 163467.

It is an arithmetic number, because the mean of its divisors is an integer number (30035089).

Almost surely, 2^172388933 is an apocalyptic number.

It is an amenable number.

172388933 is a deficient number, since it is larger than the sum of its proper divisors (7821601).

172388933 is an equidigital number, since it uses as much as digits as its factorization.

172388933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325923 (or 325900 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 172388933 is about 13129.6966073097. The cubic root of 172388933 is about 556.5486417563.

The spelling of 172388933 in words is "one hundred seventy-two million, three hundred eighty-eight thousand, nine hundred thirty-three".