172105900 has 36 divisors (see below), whose sum is σ = 374651368. Its totient is φ = 68624640.

The previous prime is 172105859. The next prime is 172105903. The reversal of 172105900 is 9501271.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (172105903) 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, 31147 + ... + 36253.

Almost surely, 2^172105900 is an apocalyptic number.

172105900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172105900 is an abundant number, since it is smaller than the sum of its proper divisors (202545468).

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

172105900 is a wasteful number, since it uses less digits than its factorization.

172105900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5458 (or 5451 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 172105900 is about 13118.9138269904. The cubic root of 172105900 is about 556.2438891724.

The spelling of 172105900 in words is "one hundred seventy-two million, one hundred five thousand, nine hundred".