18040968 has 80 divisors (see below), whose sum is σ = 55146960. Its totient is φ = 5464800.

The previous prime is 18040931. The next prime is 18040969. The reversal of 18040968 is 86904081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (18040969) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5863 + ... + 8393.

It is an arithmetic number, because the mean of its divisors is an integer number (689337).

Almost surely, 2^18040968 is an apocalyptic number.

18040968 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 18040968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27573480).

18040968 is an abundant number, since it is smaller than the sum of its proper divisors (37105992).

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

18040968 is a wasteful number, since it uses less digits than its factorization.

18040968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560 (or 2547 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18040968 is about 4247.4660681399. The cubic root of 18040968 is about 262.2728156818.

The spelling of 18040968 in words is "eighteen million, forty thousand, nine hundred sixty-eight".