8172705 has 16 divisors (see below), whose sum is σ = 13645440. Its totient is φ = 4169088.

The previous prime is 8172701. The next prime is 8172707. The reversal of 8172705 is 5072718.

It is a happy number.

8172705 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8172705 - 2² = 8172701 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8172701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11500 + ... + 12189.

It is an arithmetic number, because the mean of its divisors is an integer number (852840).

Almost surely, 2^8172705 is an apocalyptic number.

It is an amenable number.

8172705 is a deficient number, since it is larger than the sum of its proper divisors (5472735).

8172705 is a wasteful number, since it uses less digits than its factorization.

8172705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23720.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 8172705 is about 2858.7943262851. The cubic root of 8172705 is about 201.4289741813.

The spelling of 8172705 in words is "eight million, one hundred seventy-two thousand, seven hundred five".