18449856 has 70 divisors (see below), whose sum is σ = 54706520. Its totient is φ = 6148224.

The previous prime is 18449839. The next prime is 18449861. The reversal of 18449856 is 65894481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3405 + ... + 6963.

Almost surely, 2^18449856 is an apocalyptic number.

18449856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18449856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27353260).

18449856 is an abundant number, since it is smaller than the sum of its proper divisors (36256664).

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

18449856 is an equidigital number, since it uses as much as digits as its factorization.

18449856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3583 (or 3564 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 18449856 is about 4295.3295566231. The cubic root of 18449856 is about 264.2394521689.

The spelling of 18449856 in words is "eighteen million, four hundred forty-nine thousand, eight hundred fifty-six".