18905729 has 2 divisors, whose sum is σ = 18905730. Its totient is φ = 18905728.

The previous prime is 18905687. The next prime is 18905737. The reversal of 18905729 is 92750981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18905104 + 625 = 4348^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 18905729 - 2⁸ = 18905473 is a prime.

It is not a weakly prime, because it can be changed into another prime (18905749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9452864 + 9452865.

It is an arithmetic number, because the mean of its divisors is an integer number (9452865).

Almost surely, 2^18905729 is an apocalyptic number.

It is an amenable number.

18905729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18905729 is an equidigital number, since it uses as much as digits as its factorization.

18905729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 18905729 is about 4348.0718715311. The cubic root of 18905729 is about 266.3981121002.

The spelling of 18905729 in words is "eighteen million, nine hundred five thousand, seven hundred twenty-nine".