18057440 has 24 divisors (see below), whose sum is σ = 42661080. Its totient is φ = 7222912.

The previous prime is 18057437. The next prime is 18057449. The reversal of 18057440 is 4475081.

It is a super-2 number, since 2×18057440² = 652142278707200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18057449) 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, 56270 + ... + 56589.

It is an arithmetic number, because the mean of its divisors is an integer number (1777545).

Almost surely, 2^18057440 is an apocalyptic number.

18057440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18057440 is an abundant number, since it is smaller than the sum of its proper divisors (24603640).

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

18057440 is a wasteful number, since it uses less digits than its factorization.

18057440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112874 (or 112866 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 18057440 is about 4249.4046641853. The cubic root of 18057440 is about 262.3526126504.

The spelling of 18057440 in words is "eighteen million, fifty-seven thousand, four hundred forty".