172433921 has 8 divisors (see below), whose sum is σ = 196288704. Its totient is φ = 149942320.

The previous prime is 172433909. The next prime is 172433923. The reversal of 172433921 is 129334271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-172433921 is a prime.

It is a super-2 number, since 2×172433921² = 59466914222868482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172433923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340526 + ... + 341031.

It is an arithmetic number, because the mean of its divisors is an integer number (24536088).

Almost surely, 2^172433921 is an apocalyptic number.

172433921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

172433921 is a deficient number, since it is larger than the sum of its proper divisors (23854783).

172433921 is a wasteful number, since it uses less digits than its factorization.

172433921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681591.

The product of its digits is 9072, while the sum is 32.

The square root of 172433921 is about 13131.4097110706. The cubic root of 172433921 is about 556.5970513460.

The spelling of 172433921 in words is "one hundred seventy-two million, four hundred thirty-three thousand, nine hundred twenty-one".