16172639 has 8 divisors (see below), whose sum is σ = 18736800. Its totient is φ = 13671936.

The previous prime is 16172623. The next prime is 16172647. The reversal of 16172639 is 93627161.

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

It is a cyclic number.

It is not a de Polignac number, because 16172639 - 2⁴ = 16172623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16172599 and 16172608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16172699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15314 + ... + 16335.

It is an arithmetic number, because the mean of its divisors is an integer number (2342100).

Almost surely, 2^16172639 is an apocalyptic number.

16172639 is a deficient number, since it is larger than the sum of its proper divisors (2564161).

16172639 is an equidigital number, since it uses as much as digits as its factorization.

16172639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31729.

The product of its digits is 13608, while the sum is 35.

The square root of 16172639 is about 4021.5219755709. The cubic root of 16172639 is about 252.8872677052.

The spelling of 16172639 in words is "sixteen million, one hundred seventy-two thousand, six hundred thirty-nine".