18484440 has 192 divisors, whose sum is σ = 64985760. Its totient is φ = 4177920.

The previous prime is 18484409. The next prime is 18484441. The reversal of 18484440 is 4448481.

It is a happy number.

It is a super-2 number, since 2×18484440² = 683349044227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18484441) 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, 450820 + ... + 450860.

Almost surely, 2^18484440 is an apocalyptic number.

18484440 is a gapful number since it is divisible by the number (10) 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 18484440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32492880).

18484440 is an abundant number, since it is smaller than the sum of its proper divisors (46501320).

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

18484440 is a wasteful number, since it uses less digits than its factorization.

18484440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 33.

The square root of 18484440 is about 4299.3534397628. The cubic root of 18484440 is about 264.4044535142.

The spelling of 18484440 in words is "eighteen million, four hundred eighty-four thousand, four hundred forty".