18449965 has 4 divisors (see below), whose sum is σ = 22139964. Its totient is φ = 14759968.

The previous prime is 18449953. The next prime is 18449983. The reversal of 18449965 is 56994481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56994481 = 359 ⋅158759.

It can be written as a sum of positive squares in 2 ways, for example, as 10771524 + 7678441 = 3282^2 + 2771^2 .

It is a cyclic number.

It is not a de Polignac number, because 18449965 - 2¹⁷ = 18318893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1844992 + ... + 1845001.

It is an arithmetic number, because the mean of its divisors is an integer number (5534991).

Almost surely, 2^18449965 is an apocalyptic number.

It is an amenable number.

18449965 is a deficient number, since it is larger than the sum of its proper divisors (3689999).

18449965 is an equidigital number, since it uses as much as digits as its factorization.

18449965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689998.

The product of its digits is 311040, while the sum is 46.

The square root of 18449965 is about 4295.3422448042. The cubic root of 18449965 is about 264.2399725351.

The spelling of 18449965 in words is "eighteen million, four hundred forty-nine thousand, nine hundred sixty-five".