18041440 has 24 divisors (see below), whose sum is σ = 42623280. Its totient is φ = 7216512.

The previous prime is 18041383. The next prime is 18041449. The reversal of 18041440 is 4414081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18041449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56220 + ... + 56539.

It is an arithmetic number, because the mean of its divisors is an integer number (1775970).

Almost surely, 2^18041440 is an apocalyptic number.

18041440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18041440 is an abundant number, since it is smaller than the sum of its proper divisors (24581840).

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

18041440 is a wasteful number, since it uses less digits than its factorization.

18041440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112774 (or 112766 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 18041440 is about 4247.5216303157. The cubic root of 18041440 is about 262.2751029147.

It can be divided in two parts, 18041 and 440, that added together give a palindrome (18481).

The spelling of 18041440 in words is "eighteen million, forty-one thousand, four hundred forty".