18819769 has 2 divisors, whose sum is σ = 18819770. Its totient is φ = 18819768.

The previous prime is 18819763. The next prime is 18819793. The reversal of 18819769 is 96791881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16605625 + 2214144 = 4075^2 + 1488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18819769 is a prime.

It is a super-2 number, since 2×18819769² = 708367410426722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18819763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9409884 + 9409885.

It is an arithmetic number, because the mean of its divisors is an integer number (9409885).

Almost surely, 2^18819769 is an apocalyptic number.

It is an amenable number.

18819769 is a deficient number, since it is larger than the sum of its proper divisors (1).

18819769 is an equidigital number, since it uses as much as digits as its factorization.

18819769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 49.

The square root of 18819769 is about 4338.1757686843. The cubic root of 18819769 is about 265.9937483220.

The spelling of 18819769 in words is "eighteen million, eight hundred nineteen thousand, seven hundred sixty-nine".