18900440 has 64 divisors (see below), whose sum is σ = 48232800. Its totient is φ = 6607872.

The previous prime is 18900437. The next prime is 18900463. The reversal of 18900440 is 4400981.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8924 + ... + 10836.

Almost surely, 2^18900440 is an apocalyptic number.

18900440 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 18900440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24116400).

18900440 is an abundant number, since it is smaller than the sum of its proper divisors (29332360).

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

18900440 is a wasteful number, since it uses less digits than its factorization.

18900440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956 (or 1952 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18900440 is about 4347.4636283700. The cubic root of 18900440 is about 266.3732675848.

The spelling of 18900440 in words is "eighteen million, nine hundred thousand, four hundred forty".