18215040 has 128 divisors (see below), whose sum is σ = 59486400. Its totient is φ = 4739072.

The previous prime is 18215023. The next prime is 18215051. The reversal of 18215040 is 4051281.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 18214998 and 18215016.

It is a congruent number.

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, 101671 + ... + 101849.

Almost surely, 2^18215040 is an apocalyptic number.

18215040 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 18215040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29743200).

18215040 is an abundant number, since it is smaller than the sum of its proper divisors (41271360).

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

18215040 is a wasteful number, since it uses less digits than its factorization.

18215040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 18215040 is about 4267.9081527137. The cubic root of 18215040 is about 263.1136482522.

The spelling of 18215040 in words is "eighteen million, two hundred fifteen thousand, forty".