172406865 has 16 divisors (see below), whose sum is σ = 283307328. Its totient is φ = 89464896.

The previous prime is 172406813. The next prime is 172406869. The reversal of 172406865 is 568604271.

It is not a de Polignac number, because 172406865 - 2¹³ = 172398673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172406869) 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, 154767 + ... + 155876.

It is an arithmetic number, because the mean of its divisors is an integer number (17706708).

Almost surely, 2^172406865 is an apocalyptic number.

172406865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172406865 is a deficient number, since it is larger than the sum of its proper divisors (110900463).

172406865 is a wasteful number, since it uses less digits than its factorization.

172406865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310688.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 172406865 is about 13130.3794690024. The cubic root of 172406865 is about 556.5679385948.

The spelling of 172406865 in words is "one hundred seventy-two million, four hundred six thousand, eight hundred sixty-five".