18442969 has 2 divisors, whose sum is σ = 18442970. Its totient is φ = 18442968.

The previous prime is 18442967. The next prime is 18443003. The reversal of 18442969 is 96924481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 2442969 = 4000^2 + 1563^2 .

It is a cyclic number.

It is not a de Polignac number, because 18442969 - 2¹ = 18442967 is a prime.

It is a super-2 number, since 2×18442969² = 680286211069922, which contains 22 as substring.

Together with 18442967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18442967) 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, 9221484 + 9221485.

It is an arithmetic number, because the mean of its divisors is an integer number (9221485).

Almost surely, 2^18442969 is an apocalyptic number.

It is an amenable number.

18442969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18442969 is an equidigital number, since it uses as much as digits as its factorization.

18442969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 18442969 is about 4294.5277970925. The cubic root of 18442969 is about 264.2065694626.

The spelling of 18442969 in words is "eighteen million, four hundred forty-two thousand, nine hundred sixty-nine".