18489936 has 80 divisors (see below), whose sum is σ = 50889600. Its totient is φ = 5773824.

The previous prime is 18489917. The next prime is 18489937. The reversal of 18489936 is 63998481.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18489937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51325 + ... + 51683.

It is an arithmetic number, because the mean of its divisors is an integer number (636120).

Almost surely, 2^18489936 is an apocalyptic number.

18489936 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 18489936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25444800).

18489936 is an abundant number, since it is smaller than the sum of its proper divisors (32399664).

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

18489936 is a wasteful number, since it uses less digits than its factorization.

18489936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 430 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 18489936 is about 4299.9925581331. The cubic root of 18489936 is about 264.4306561451.

The spelling of 18489936 in words is "eighteen million, four hundred eighty-nine thousand, nine hundred thirty-six".