172105190 has 32 divisors (see below), whose sum is σ = 313637184. Its totient is φ = 67993600.

The previous prime is 172105187. The next prime is 172105243. The reversal of 172105190 is 91501271.

It is a super-2 number, since 2×172105190² = 59240392849872200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 428990 + ... + 429390.

It is an arithmetic number, because the mean of its divisors is an integer number (9801162).

Almost surely, 2^172105190 is an apocalyptic number.

172105190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172105190 is a deficient number, since it is larger than the sum of its proper divisors (141531994).

172105190 is a wasteful number, since it uses less digits than its factorization.

172105190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 172105190 is about 13118.8867667954. The cubic root of 172105190 is about 556.2431242680.

The spelling of 172105190 in words is "one hundred seventy-two million, one hundred five thousand, one hundred ninety".