172390705 has 8 divisors (see below), whose sum is σ = 217756800. Its totient is φ = 130653936.

The previous prime is 172390661. The next prime is 172390709. The reversal of 172390705 is 507093271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172390705 - 2⁷ = 172390577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172390709) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 907225 + ... + 907414.

It is an arithmetic number, because the mean of its divisors is an integer number (27219600).

Almost surely, 2^172390705 is an apocalyptic number.

It is an amenable number.

172390705 is a deficient number, since it is larger than the sum of its proper divisors (45366095).

172390705 is a wasteful number, since it uses less digits than its factorization.

172390705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814663.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 172390705 is about 13129.7640877512. The cubic root of 172390705 is about 556.5505486861.

The spelling of 172390705 in words is "one hundred seventy-two million, three hundred ninety thousand, seven hundred five".