172421830 has 32 divisors (see below), whose sum is σ = 362951424. Its totient is φ = 57740256.

The previous prime is 172421819. The next prime is 172421857. The reversal of 172421830 is 38124271.

172421830 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25632 + ... + 31651.

It is an arithmetic number, because the mean of its divisors is an integer number (11342232).

Almost surely, 2^172421830 is an apocalyptic number.

172421830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172421830 is an abundant number, since it is smaller than the sum of its proper divisors (190529594).

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

172421830 is a wasteful number, since it uses less digits than its factorization.

172421830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57340.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 172421830 is about 13130.9493183090. The cubic root of 172421830 is about 556.5840415851.

The spelling of 172421830 in words is "one hundred seventy-two million, four hundred twenty-one thousand, eight hundred thirty".