18823969 has 2 divisors, whose sum is σ = 18823970. Its totient is φ = 18823968.

The previous prime is 18823967. The next prime is 18824027. The reversal of 18823969 is 96932881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18809569 + 14400 = 4337^2 + 120^2 .

It is an emirp because it is prime and its reverse (96932881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18823969 - 2¹ = 18823967 is a prime.

It is a super-2 number, since 2×18823969² = 708683617825922, which contains 22 as substring.

Together with 18823967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18823963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9411984 + 9411985.

It is an arithmetic number, because the mean of its divisors is an integer number (9411985).

Almost surely, 2^18823969 is an apocalyptic number.

It is an amenable number.

18823969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18823969 is an equidigital number, since it uses as much as digits as its factorization.

18823969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 18823969 is about 4338.6598161183. The cubic root of 18823969 is about 266.0135340882.

The spelling of 18823969 in words is "eighteen million, eight hundred twenty-three thousand, nine hundred sixty-nine".