18489856 has 120 divisors (see below), whose sum is σ = 47581776. Its totient is φ = 7096320.

The previous prime is 18489841. The next prime is 18489901. The reversal of 18489856 is 65898481.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 275935 + ... + 276001.

Almost surely, 2^18489856 is an apocalyptic number.

18489856 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 18489856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23790888).

18489856 is an abundant number, since it is smaller than the sum of its proper divisors (29091920).

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

18489856 is an equidigital number, since it uses as much as digits as its factorization.

18489856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 87 counting only the distinct ones).

The product of its digits is 552960, while the sum is 49.

The square root of 18489856 is about 4299.9832557814. The cubic root of 18489856 is about 264.4302747758.

The spelling of 18489856 in words is "eighteen million, four hundred eighty-nine thousand, eight hundred fifty-six".