18815040 has 168 divisors, whose sum is σ = 66568320. Its totient is φ = 4875264.

The previous prime is 18815029. The next prime is 18815057. The reversal of 18815040 is 4051881.

It is a junction number, because it is equal to n+sod(n) for n = 18814995 and 18815013.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135291 + ... + 135429.

It is an arithmetic number, because the mean of its divisors is an integer number (396240).

Almost surely, 2^18815040 is an apocalyptic number.

18815040 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 18815040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33284160).

18815040 is an abundant number, since it is smaller than the sum of its proper divisors (47753280).

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

18815040 is a wasteful number, since it uses less digits than its factorization.

18815040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18815040 is about 4337.6306896738. The cubic root of 18815040 is about 265.9714669679.

The spelling of 18815040 in words is "eighteen million, eight hundred fifteen thousand, forty".