172939487 has 16 divisors (see below), whose sum is σ = 209664000. Its totient is φ = 139252608.

The previous prime is 172939471. The next prime is 172939489. The reversal of 172939487 is 784939271.

It is a cyclic number.

It is not a de Polignac number, because 172939487 - 2⁴ = 172939471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172939489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85514 + ... + 87512.

It is an arithmetic number, because the mean of its divisors is an integer number (13104000).

Almost surely, 2^172939487 is an apocalyptic number.

172939487 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

172939487 is a deficient number, since it is larger than the sum of its proper divisors (36724513).

172939487 is a wasteful number, since it uses less digits than its factorization.

172939487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750.

The product of its digits is 762048, while the sum is 50.

The square root of 172939487 is about 13150.6458776746. The cubic root of 172939487 is about 557.1404903973.

The spelling of 172939487 in words is "one hundred seventy-two million, nine hundred thirty-nine thousand, four hundred eighty-seven".