18736769 has 2 divisors, whose sum is σ = 18736770. Its totient is φ = 18736768.

The previous prime is 18736759. The next prime is 18736787. The reversal of 18736769 is 96763781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16096144 + 2640625 = 4012^2 + 1625^2 .

It is an emirp because it is prime and its reverse (96763781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18736769 is a prime.

It is a super-2 number, since 2×18736769² = 702133025118722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18736709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9368384 + 9368385.

It is an arithmetic number, because the mean of its divisors is an integer number (9368385).

Almost surely, 2^18736769 is an apocalyptic number.

It is an amenable number.

18736769 is a deficient number, since it is larger than the sum of its proper divisors (1).

18736769 is an equidigital number, since it uses as much as digits as its factorization.

18736769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 18736769 is about 4328.5989650232. The cubic root of 18736769 is about 265.6021385446.

The spelling of 18736769 in words is "eighteen million, seven hundred thirty-six thousand, seven hundred sixty-nine".