18090408 has 48 divisors (see below), whose sum is σ = 52613280. Its totient is φ = 5168352.

The previous prime is 18090379. The next prime is 18090409. The reversal of 18090408 is 80409081.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18090409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6516 + ... + 8867.

It is an arithmetic number, because the mean of its divisors is an integer number (1096110).

Almost surely, 2^18090408 is an apocalyptic number.

It is an amenable number.

18090408 is an abundant number, since it is smaller than the sum of its proper divisors (34522872).

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

18090408 is a wasteful number, since it uses less digits than its factorization.

18090408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15406 (or 15395 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 18090408 is about 4253.2820268588. The cubic root of 18090408 is about 262.5121772129.

Adding to 18090408 its reverse (80409081), we get a palindrome (98499489).

The spelling of 18090408 in words is "eighteen million, ninety thousand, four hundred eight".