172908388 has 12 divisors (see below), whose sum is σ = 315745920. Its totient is φ = 82695272.

The previous prime is 172908367. The next prime is 172908389. The reversal of 172908388 is 883809271.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (172908389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939628 + ... + 939811.

It is an arithmetic number, because the mean of its divisors is an integer number (26312160).

Almost surely, 2^172908388 is an apocalyptic number.

It is an amenable number.

172908388 is a deficient number, since it is larger than the sum of its proper divisors (142837532).

172908388 is a wasteful number, since it uses less digits than its factorization.

172908388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879466 (or 1879464 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 172908388 is about 13149.4634111054. The cubic root of 172908388 is about 557.1070922973.

The spelling of 172908388 in words is "one hundred seventy-two million, nine hundred eight thousand, three hundred eighty-eight".