18646449 has 16 divisors (see below), whose sum is σ = 26054400. Its totient is φ = 11846016.

The previous prime is 18646427. The next prime is 18646457. The reversal of 18646449 is 94464681.

It is not a de Polignac number, because 18646449 - 2⁵ = 18646417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18646449.

It is not an unprimeable number, because it can be changed into a prime (18646489) 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, 5517 + ... + 8229.

It is an arithmetic number, because the mean of its divisors is an integer number (1628400).

Almost surely, 2^18646449 is an apocalyptic number.

It is an amenable number.

18646449 is a deficient number, since it is larger than the sum of its proper divisors (7407951).

18646449 is a wasteful number, since it uses less digits than its factorization.

18646449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824.

The product of its digits is 165888, while the sum is 42.

The square root of 18646449 is about 4318.1534247870. The cubic root of 18646449 is about 265.1746753912.

The spelling of 18646449 in words is "eighteen million, six hundred forty-six thousand, four hundred forty-nine".