18209040 has 80 divisors (see below), whose sum is σ = 59781888. Its totient is φ = 4569088.

The previous prime is 18209033. The next prime is 18209063. The reversal of 18209040 is 4090281.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 18209040.

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, 1849 + ... + 6311.

Almost surely, 2^18209040 is an apocalyptic number.

18209040 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 18209040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29890944).

18209040 is an abundant number, since it is smaller than the sum of its proper divisors (41572848).

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

18209040 is a wasteful number, since it uses less digits than its factorization.

18209040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4496 (or 4490 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18209040 is about 4267.2051743501. The cubic root of 18209040 is about 263.0847553655.

The spelling of 18209040 in words is "eighteen million, two hundred nine thousand, forty".