18443040 has 192 divisors, whose sum is σ = 72576000. Its totient is φ = 3824640.

The previous prime is 18443003. The next prime is 18443059. The reversal of 18443040 is 4034481.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 18443040.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36711 + ... + 37209.

It is an arithmetic number, because the mean of its divisors is an integer number (378000).

Almost surely, 2^18443040 is an apocalyptic number.

18443040 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 18443040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36288000).

18443040 is an abundant number, since it is smaller than the sum of its proper divisors (54132960).

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

18443040 is a wasteful number, since it uses less digits than its factorization.

18443040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 18443040 is about 4294.5360634183. The cubic root of 18443040 is about 264.2069085013.

It can be divided in two parts, 1844 and 3040, that added together give a palindrome (4884).

The spelling of 18443040 in words is "eighteen million, four hundred forty-three thousand, forty".