172398863 has 16 divisors (see below), whose sum is σ = 215179776. Its totient is φ = 134477280.

The previous prime is 172398859. The next prime is 172398907. The reversal of 172398863 is 368893271.

It is not a de Polignac number, because 172398863 - 2² = 172398859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172398803) 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 15 ways as a sum of consecutive naturals, for example, 6881 + ... + 19802.

It is an arithmetic number, because the mean of its divisors is an integer number (13448736).

Almost surely, 2^172398863 is an apocalyptic number.

172398863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

172398863 is a deficient number, since it is larger than the sum of its proper divisors (42780913).

172398863 is a wasteful number, since it uses less digits than its factorization.

172398863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26774.

The product of its digits is 435456, while the sum is 47.

The square root of 172398863 is about 13130.0747522625. The cubic root of 172398863 is about 556.5593277127.

The spelling of 172398863 in words is "one hundred seventy-two million, three hundred ninety-eight thousand, eight hundred sixty-three".