172372240 has 40 divisors (see below), whose sum is σ = 406759680. Its totient is φ = 67917696.

The previous prime is 172372219. The next prime is 172372243. The reversal of 172372240 is 42273271.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 172372199 and 172372208.

It is not an unprimeable number, because it can be changed into a prime (172372243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10720 + ... + 21439.

It is an arithmetic number, because the mean of its divisors is an integer number (10168992).

Almost surely, 2^172372240 is an apocalyptic number.

172372240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172372240 is the 10720-th pentagonal number.

It is an amenable number.

172372240 is an abundant number, since it is smaller than the sum of its proper divisors (234387440).

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

172372240 is a wasteful number, since it uses less digits than its factorization.

172372240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32239 (or 32233 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 172372240 is about 13129.0608955858. The cubic root of 172372240 is about 556.5306770176.

The spelling of 172372240 in words is "one hundred seventy-two million, three hundred seventy-two thousand, two hundred forty".