18395969 has 2 divisors, whose sum is σ = 18395970. Its totient is φ = 18395968.

The previous prime is 18395963. The next prime is 18395981. The reversal of 18395969 is 96959381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18386944 + 9025 = 4288^2 + 95^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18395969 is a prime.

It is a super-2 number, since 2×18395969² = 676823350897922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18395963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9197984 + 9197985.

It is an arithmetic number, because the mean of its divisors is an integer number (9197985).

Almost surely, 2^18395969 is an apocalyptic number.

It is an amenable number.

18395969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18395969 is an equidigital number, since it uses as much as digits as its factorization.

18395969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 18395969 is about 4289.0522263083. The cubic root of 18395969 is about 263.9819441661.

The spelling of 18395969 in words is "eighteen million, three hundred ninety-five thousand, nine hundred sixty-nine".