172921696 has 24 divisors (see below), whose sum is σ = 343816704. Its totient is φ = 85603200.

The previous prime is 172921667. The next prime is 172921709. The reversal of 172921696 is 696129271.

It is a happy number.

172921696 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23520 + ... + 29983.

It is an arithmetic number, because the mean of its divisors is an integer number (14325696).

Almost surely, 2^172921696 is an apocalyptic number.

172921696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172921696 is a deficient number, since it is larger than the sum of its proper divisors (170895008).

172921696 is a wasteful number, since it uses less digits than its factorization.

172921696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53614 (or 53606 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 172921696 is about 13149.9694296223. The cubic root of 172921696 is about 557.1213846269.

The spelling of 172921696 in words is "one hundred seventy-two million, nine hundred twenty-one thousand, six hundred ninety-six".