172199988 has 36 divisors (see below), whose sum is σ = 454210848. Its totient is φ = 54904080.

The previous prime is 172199981. The next prime is 172200019. The reversal of 172199988 is 889991271.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172199981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103158 + ... + 104813.

It is an arithmetic number, because the mean of its divisors is an integer number (12616968).

Almost surely, 2^172199988 is an apocalyptic number.

172199988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

172199988 is an abundant number, since it is smaller than the sum of its proper divisors (282010860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172199988 is a wasteful number, since it uses less digits than its factorization.

172199988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208004 (or 207999 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The square root of 172199988 is about 13122.4993046294. The cubic root of 172199988 is about 556.3452344117.

The spelling of 172199988 in words is "one hundred seventy-two million, one hundred ninety-nine thousand, nine hundred eighty-eight".