172689639 has 8 divisors (see below), whose sum is σ = 231286272. Its totient is φ = 114609720.

The previous prime is 172689617. The next prime is 172689641. The reversal of 172689639 is 936986271.

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

It is not a de Polignac number, because 172689639 - 2⁵ = 172689607 is a prime.

It is a super-2 number, since 2×172689639² = 59643422835900642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 172689591 and 172689600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172689739) 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, 128397 + ... + 129734.

It is an arithmetic number, because the mean of its divisors is an integer number (28910784).

Almost surely, 2^172689639 is an apocalyptic number.

172689639 is a deficient number, since it is larger than the sum of its proper divisors (58596633).

172689639 is a wasteful number, since it uses less digits than its factorization.

172689639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258357.

The product of its digits is 979776, while the sum is 51.

The square root of 172689639 is about 13141.1429868182. The cubic root of 172689639 is about 556.8720583030.

The spelling of 172689639 in words is "one hundred seventy-two million, six hundred eighty-nine thousand, six hundred thirty-nine".