173909972 has 6 divisors (see below), whose sum is σ = 304342458. Its totient is φ = 86954984.

The previous prime is 173909971. The next prime is 173910007. The reversal of 173909972 is 279909371.

It can be written as a sum of positive squares in only one way, i.e., 94984516 + 78925456 = 9746^2 + 8884^2 .

It is a super-2 number, since 2×173909972² = 60489356722081568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173909971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21738743 + ... + 21738750.

It is an arithmetic number, because the mean of its divisors is an integer number (50723743).

Almost surely, 2^173909972 is an apocalyptic number.

It is an amenable number.

173909972 is a deficient number, since it is larger than the sum of its proper divisors (130432486).

173909972 is a wasteful number, since it uses less digits than its factorization.

173909972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43477497 (or 43477495 counting only the distinct ones).

The product of its (nonzero) digits is 214326, while the sum is 47.

The square root of 173909972 is about 13187.4930142162. The cubic root of 173909972 is about 558.1807159511.

The spelling of 173909972 in words is "one hundred seventy-three million, nine hundred nine thousand, nine hundred seventy-two".