172729899 has 24 divisors (see below), whose sum is σ = 254083440. Its totient is φ = 113052672.

The previous prime is 172729871. The next prime is 172729901. The reversal of 172729899 is 998927271.

172729899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172729899 - 2⁹ = 172729387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172729849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185467 + ... + 186395.

It is an arithmetic number, because the mean of its divisors is an integer number (10586810).

Almost surely, 2^172729899 is an apocalyptic number.

172729899 is a deficient number, since it is larger than the sum of its proper divisors (81353541).

172729899 is a wasteful number, since it uses less digits than its factorization.

172729899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291 (or 1288 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 172729899 is about 13142.6747277714. The cubic root of 172729899 is about 556.9153303973.

It can be divided in two parts, 1727 and 29899, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 172729899 in words is "one hundred seventy-two million, seven hundred twenty-nine thousand, eight hundred ninety-nine".