18499444 has 12 divisors (see below), whose sum is σ = 32677344. Its totient is φ = 9163064.

The previous prime is 18499433. The next prime is 18499447. The reversal of 18499444 is 44499481.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18499444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18499447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21184 + ... + 22039.

It is an arithmetic number, because the mean of its divisors is an integer number (2723112).

Almost surely, 2^18499444 is an apocalyptic number.

It is an amenable number.

18499444 is a deficient number, since it is larger than the sum of its proper divisors (14177900).

18499444 is a wasteful number, since it uses less digits than its factorization.

18499444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43334 (or 43332 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 18499444 is about 4301.0979993485. The cubic root of 18499444 is about 264.4759740565.

The spelling of 18499444 in words is "eighteen million, four hundred ninety-nine thousand, four hundred forty-four".