18505769 has 2 divisors, whose sum is σ = 18505770. Its totient is φ = 18505768.

The previous prime is 18505759. The next prime is 18505783. The reversal of 18505769 is 96750581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9535744 + 8970025 = 3088^2 + 2995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18505769 is a prime.

It is a super-2 number, since 2×18505769² = 684926972562722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18505709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9252884 + 9252885.

It is an arithmetic number, because the mean of its divisors is an integer number (9252885).

Almost surely, 2^18505769 is an apocalyptic number.

It is an amenable number.

18505769 is a deficient number, since it is larger than the sum of its proper divisors (1).

18505769 is an equidigital number, since it uses as much as digits as its factorization.

18505769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 18505769 is about 4301.8332138752. The cubic root of 18505769 is about 264.5061122583.

The spelling of 18505769 in words is "eighteen million, five hundred five thousand, seven hundred sixty-nine".