172839906 has 20 divisors (see below), whose sum is σ = 387289782. Its totient is φ = 57613248.

The previous prime is 172839899. The next prime is 172839937. The reversal of 172839906 is 609938271.

172839906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 170067681 + 2772225 = 13041^2 + 1665^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 533295 + ... + 533618.

Almost surely, 2^172839906 is an apocalyptic number.

172839906 is an abundant number, since it is smaller than the sum of its proper divisors (214449876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172839906 is a wasteful number, since it uses less digits than its factorization.

172839906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066927 (or 1066918 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 172839906 is about 13146.8591686380. The cubic root of 172839906 is about 557.0335334102.

The spelling of 172839906 in words is "one hundred seventy-two million, eight hundred thirty-nine thousand, nine hundred six".