172218130 has 32 divisors (see below), whose sum is σ = 357799680. Its totient is φ = 58459200.

The previous prime is 172218127. The next prime is 172218149. The reversal of 172218130 is 31812271.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 172218095 and 172218104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5110 + ... + 19249.

It is an arithmetic number, because the mean of its divisors is an integer number (11181240).

Almost surely, 2^172218130 is an apocalyptic number.

172218130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172218130 is an abundant number, since it is smaller than the sum of its proper divisors (185581550).

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

172218130 is a wasteful number, since it uses less digits than its factorization.

172218130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24474.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 172218130 is about 13123.1905419376. The cubic root of 172218130 is about 556.3647715033.

The spelling of 172218130 in words is "one hundred seventy-two million, two hundred eighteen thousand, one hundred thirty".