173994921 has 6 divisors (see below), whose sum is σ = 251326010. Its totient is φ = 115996608.

The previous prime is 173994917. The next prime is 173994967. The reversal of 173994921 is 129499371.

173994921 is a `hidden beast` number, since 1 + 73 + 99 + 492 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 134304921 + 39690000 = 11589^2 + 6300^2 .

It is not a de Polignac number, because 173994921 - 2² = 173994917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (173994901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9666376 + ... + 9666393.

Almost surely, 2^173994921 is an apocalyptic number.

It is an amenable number.

173994921 is a deficient number, since it is larger than the sum of its proper divisors (77331089).

173994921 is a wasteful number, since it uses less digits than its factorization.

173994921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19332775 (or 19332772 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 173994921 is about 13190.7134378698. The cubic root of 173994921 is about 558.2715851418.

The spelling of 173994921 in words is "one hundred seventy-three million, nine hundred ninety-four thousand, nine hundred twenty-one".