18006408 has 64 divisors (see below), whose sum is σ = 57168000. Its totient is φ = 5144256.

The previous prime is 18006389. The next prime is 18006413. The reversal of 18006408 is 80460081.

18006408 is a `hidden beast` number, since 18 + 0 + 0 + 640 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 4443 + ... + 7466.

It is an arithmetic number, because the mean of its divisors is an integer number (893250).

Almost surely, 2^18006408 is an apocalyptic number.

18006408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18006408 is an abundant number, since it is smaller than the sum of its proper divisors (39161592).

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

18006408 is a wasteful number, since it uses less digits than its factorization.

18006408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11931 (or 11921 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18006408 is about 4243.3958099616. The cubic root of 18006408 is about 262.1052351957.

Adding to 18006408 its reverse (80460081), we get a palindrome (98466489).

The spelling of 18006408 in words is "eighteen million, six thousand, four hundred eight".