18040608 has 72 divisors (see below), whose sum is σ = 52720668. Its totient is φ = 5847552.

The previous prime is 18040601. The next prime is 18040609. The reversal of 18040608 is 80604081.

18040608 is a `hidden beast` number, since 18 + 0 + 40 + 608 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17539344 + 501264 = 4188^2 + 708^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (18040601) 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, 9810 + ... + 11502.

Almost surely, 2^18040608 is an apocalyptic number.

18040608 is a gapful number since it is divisible by the number (18) 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 18040608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26360334).

18040608 is an abundant number, since it is smaller than the sum of its proper divisors (34680060).

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

18040608 is a wasteful number, since it uses less digits than its factorization.

18040608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746 (or 1735 counting only the distinct ones).

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

The square root of 18040608 is about 4247.4236897206. The cubic root of 18040608 is about 262.2710711552.

Adding to 18040608 its reverse (80604081), we get a palindrome (98644689).

The spelling of 18040608 in words is "eighteen million, forty thousand, six hundred eight".