18065440 has 24 divisors (see below), whose sum is σ = 42679980. Its totient is φ = 7226112.

The previous prime is 18065417. The next prime is 18065449. The reversal of 18065440 is 4456081.

It can be written as a sum of positive squares in 2 ways, for example, as 17073424 + 992016 = 4132^2 + 996^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18065399 and 18065408.

It is not an unprimeable number, because it can be changed into a prime (18065449) 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, 56295 + ... + 56614.

Almost surely, 2^18065440 is an apocalyptic number.

18065440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18065440 is an abundant number, since it is smaller than the sum of its proper divisors (24614540).

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

18065440 is a wasteful number, since it uses less digits than its factorization.

18065440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112924 (or 112916 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 18065440 is about 4250.3458682794. The cubic root of 18065440 is about 262.3913503494.

The spelling of 18065440 in words is "eighteen million, sixty-five thousand, four hundred forty".