18396040 has 64 divisors (see below), whose sum is σ = 47219760. Its totient is φ = 6389760.

The previous prime is 18396013. The next prime is 18396071. The reversal of 18396040 is 4069381.

It can be written as a sum of positive squares in 8 ways, for example, as 5963364 + 12432676 = 2442^2 + 3526^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18395993 and 18396011.

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, 7800 + ... + 9880.

Almost surely, 2^18396040 is an apocalyptic number.

18396040 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 18396040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23609880).

18396040 is an abundant number, since it is smaller than the sum of its proper divisors (28823720).

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

18396040 is a wasteful number, since it uses less digits than its factorization.

18396040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122 (or 2118 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 18396040 is about 4289.0605031871. The cubic root of 18396040 is about 263.9822837821.

The spelling of 18396040 in words is "eighteen million, three hundred ninety-six thousand, forty".