18040698 has 64 divisors (see below), whose sum is σ = 44620800. Its totient is φ = 5365440.

The previous prime is 18040691. The next prime is 18040703. The reversal of 18040698 is 89604081.

It is a happy number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (18040691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21348 + ... + 22176.

It is an arithmetic number, because the mean of its divisors is an integer number (697200).

Almost surely, 2^18040698 is an apocalyptic number.

18040698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18040698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22310400).

18040698 is an abundant number, since it is smaller than the sum of its proper divisors (26580102).

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

18040698 is a wasteful number, since it uses less digits than its factorization.

18040698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884 (or 878 counting only the distinct ones).

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

The square root of 18040698 is about 4247.4342843651. The cubic root of 18040698 is about 262.2715072890.

The spelling of 18040698 in words is "eighteen million, forty thousand, six hundred ninety-eight".