172057905 has 32 divisors (see below), whose sum is σ = 315755520. Its totient is φ = 88801920.

The previous prime is 172057891. The next prime is 172057913. The reversal of 172057905 is 509750271.

It is not a de Polignac number, because 172057905 - 2⁸ = 172057649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172057905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16372 + ... + 24741.

It is an arithmetic number, because the mean of its divisors is an integer number (9867360).

Almost surely, 2^172057905 is an apocalyptic number.

172057905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172057905 is a deficient number, since it is larger than the sum of its proper divisors (143697615).

172057905 is a wasteful number, since it uses less digits than its factorization.

172057905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41158 (or 41152 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 36.

The square root of 172057905 is about 13117.0844702624. The cubic root of 172057905 is about 556.1921779731.

The spelling of 172057905 in words is "one hundred seventy-two million, fifty-seven thousand, nine hundred five".