18000408 has 32 divisors (see below), whose sum is σ = 45308160. Its totient is φ = 5959200.

The previous prime is 18000407. The next prime is 18000439. The reversal of 18000408 is 80400081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1141 + ... + 6107.

It is an arithmetic number, because the mean of its divisors is an integer number (1415880).

Almost surely, 2^18000408 is an apocalyptic number.

It is an amenable number.

18000408 is an abundant number, since it is smaller than the sum of its proper divisors (27307752).

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

18000408 is a wasteful number, since it uses less digits than its factorization.

18000408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5127 (or 5123 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 18000408 is about 4242.6887701079. The cubic root of 18000408 is about 262.0761195216.

Adding to 18000408 its reverse (80400081), we get a palindrome (98400489).

The spelling of 18000408 in words is "eighteen million, four hundred eight", and thus it is an aban number.