192904321 has 27 divisors (see below), whose sum is σ = 221418531. Its totient is φ = 168001344.

The previous prime is 192904307. The next prime is 192904331. The reversal of 192904321 is 123409291.

The square root of 192904321 is 13889.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 150185025 + 42719296 = 12255^2 + 6536^2 .

It is not a de Polignac number, because 192904321 - 2⁷ = 192904193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (192904301) 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 26 ways as a sum of consecutive naturals, for example, 4486126 + ... + 4486168.

Almost surely, 2^192904321 is an apocalyptic number.

192904321 is the 13889-th square number.

192904321 is the 6945-th centered octagonal number.

It is an amenable number.

192904321 is a deficient number, since it is larger than the sum of its proper divisors (28514210).

192904321 is an equidigital number, since it uses as much as digits as its factorization.

192904321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The cubic root of 192904321 is about 577.8041435604.

The spelling of 192904321 in words is "one hundred ninety-two million, nine hundred four thousand, three hundred twenty-one".