18489744 has 240 divisors, whose sum is σ = 68245632. Its totient is φ = 4534272.

The previous prime is 18489743. The next prime is 18489773. The reversal of 18489744 is 44798481.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 18489744.

It is not an unprimeable number, because it can be changed into a prime (18489743) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 222727 + ... + 222809.

Almost surely, 2^18489744 is an apocalyptic number.

18489744 is a gapful number since it is divisible by the number (14) 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 18489744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34122816).

18489744 is an abundant number, since it is smaller than the sum of its proper divisors (49755888).

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

18489744 is a wasteful number, since it uses less digits than its factorization.

18489744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 125 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 18489744 is about 4299.9702324551. The cubic root of 18489744 is about 264.4297408569.

The spelling of 18489744 in words is "eighteen million, four hundred eighty-nine thousand, seven hundred forty-four".