18449964 has 96 divisors (see below), whose sum is σ = 54613440. Its totient is φ = 5336064.

The previous prime is 18449953. The next prime is 18449983. The reversal of 18449964 is 46994481.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23482 + ... + 24254.

It is an arithmetic number, because the mean of its divisors is an integer number (568890).

Almost surely, 2^18449964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18449964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27306720).

18449964 is an abundant number, since it is smaller than the sum of its proper divisors (36163476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18449964 is a wasteful number, since it uses less digits than its factorization.

18449964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 808 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 18449964 is about 4295.3421283991. The cubic root of 18449964 is about 264.2399677611.

The spelling of 18449964 in words is "eighteen million, four hundred forty-nine thousand, nine hundred sixty-four".