423173921 has 8 divisors (see below), whose sum is σ = 435242880. Its totient is φ = 411138288.

The previous prime is 423173903. The next prime is 423173953. The reversal of 423173921 is 129371324.

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

It is a cyclic number.

It is not a de Polignac number, because 423173921 - 2¹⁸ = 422911777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423173221) 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, 18650 + ... + 34556.

It is an arithmetic number, because the mean of its divisors is an integer number (54405360).

Almost surely, 2^423173921 is an apocalyptic number.

It is an amenable number.

423173921 is a deficient number, since it is larger than the sum of its proper divisors (12068959).

423173921 is a wasteful number, since it uses less digits than its factorization.

423173921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16663.

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

The square root of 423173921 is about 20571.1915308764. The cubic root of 423173921 is about 750.7689423305.

The spelling of 423173921 in words is "four hundred twenty-three million, one hundred seventy-three thousand, nine hundred twenty-one".