172470809 has 16 divisors (see below), whose sum is σ = 209404800. Its totient is φ = 138754944.

The previous prime is 172470803. The next prime is 172470821. The reversal of 172470809 is 908074271.

It is a cyclic number.

It is not a de Polignac number, because 172470809 - 2⁸ = 172470553 is a prime.

It is a super-2 number, since 2×172470809² = 59492359914228962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172470803) 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 15 ways as a sum of consecutive naturals, for example, 8549 + ... + 20445.

It is an arithmetic number, because the mean of its divisors is an integer number (13087800).

Almost surely, 2^172470809 is an apocalyptic number.

172470809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

172470809 is a deficient number, since it is larger than the sum of its proper divisors (36933991).

172470809 is a wasteful number, since it uses less digits than its factorization.

172470809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12032.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 172470809 is about 13132.8142071682. The cubic root of 172470809 is about 556.6367386032.

The spelling of 172470809 in words is "one hundred seventy-two million, four hundred seventy thousand, eight hundred nine".