18189929 has 2 divisors, whose sum is σ = 18189930. Its totient is φ = 18189928.

The previous prime is 18189923. The next prime is 18189947. The reversal of 18189929 is 92998181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 1827904 = 4045^2 + 1352^2 .

It is a cyclic number.

It is not a de Polignac number, because 18189929 - 2²⁰ = 17141353 is a prime.

It is not a weakly prime, because it can be changed into another prime (18189923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9094964 + 9094965.

It is an arithmetic number, because the mean of its divisors is an integer number (9094965).

Almost surely, 2^18189929 is an apocalyptic number.

It is an amenable number.

18189929 is a deficient number, since it is larger than the sum of its proper divisors (1).

18189929 is an equidigital number, since it uses as much as digits as its factorization.

18189929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 47.

The square root of 18189929 is about 4264.9652988037. The cubic root of 18189929 is about 262.9926843806.

The spelling of 18189929 in words is "eighteen million, one hundred eighty-nine thousand, nine hundred twenty-nine".