18769969 has 2 divisors, whose sum is σ = 18769970. Its totient is φ = 18769968.

The previous prime is 18769951. The next prime is 18769991. The reversal of 18769969 is 96996781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 1129969 = 4200^2 + 1063^2 .

It is a cyclic number.

It is not a de Polignac number, because 18769969 - 2¹⁷ = 18638897 is a prime.

It is a super-2 number, since 2×18769969² = 704623472521922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18769369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9384984 + 9384985.

It is an arithmetic number, because the mean of its divisors is an integer number (9384985).

Almost surely, 2^18769969 is an apocalyptic number.

It is an amenable number.

18769969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18769969 is an equidigital number, since it uses as much as digits as its factorization.

18769969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 55.

The square root of 18769969 is about 4332.4322268213. The cubic root of 18769969 is about 265.7589209630.

The spelling of 18769969 in words is "eighteen million, seven hundred sixty-nine thousand, nine hundred sixty-nine".