18308929 has 2 divisors, whose sum is σ = 18308930. Its totient is φ = 18308928.

The previous prime is 18308923. The next prime is 18308959. The reversal of 18308929 is 92980381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16200625 + 2108304 = 4025^2 + 1452^2 .

It is a cyclic number.

It is not a de Polignac number, because 18308929 - 2³ = 18308921 is a prime.

It is a super-2 number, since 2×18308929² = 670433762254082, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18308891 and 18308900.

It is not a weakly prime, because it can be changed into another prime (18308921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9154464 + 9154465.

It is an arithmetic number, because the mean of its divisors is an integer number (9154465).

Almost surely, 2^18308929 is an apocalyptic number.

It is an amenable number.

18308929 is a deficient number, since it is larger than the sum of its proper divisors (1).

18308929 is an equidigital number, since it uses as much as digits as its factorization.

18308929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 18308929 is about 4278.8934317181. The cubic root of 18308929 is about 263.5649447989.

The spelling of 18308929 in words is "eighteen million, three hundred eight thousand, nine hundred twenty-nine".