18516449 has 16 divisors (see below), whose sum is σ = 22560768. Its totient is φ = 14852112.

The previous prime is 18516439. The next prime is 18516479. The reversal of 18516449 is 94461581.

It is not a de Polignac number, because 18516449 - 2⁸ = 18516193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18516409) 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 in 15 ways as a sum of consecutive naturals, for example, 6344 + ... + 8790.

It is an arithmetic number, because the mean of its divisors is an integer number (1410048).

Almost surely, 2^18516449 is an apocalyptic number.

It is an amenable number.

18516449 is a deficient number, since it is larger than the sum of its proper divisors (4044319).

18516449 is a wasteful number, since it uses less digits than its factorization.

18516449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524.

The product of its digits is 34560, while the sum is 38.

The square root of 18516449 is about 4303.0743660783. The cubic root of 18516449 is about 264.5569861599.

The spelling of 18516449 in words is "eighteen million, five hundred sixteen thousand, four hundred forty-nine".