18440718 has 8 divisors (see below), whose sum is σ = 36881448. Its totient is φ = 6146904.

The previous prime is 18440707. The next prime is 18440731. The reversal of 18440718 is 81704481.

It is a sphenic number, since it is the product of 3 distinct primes.

18440718 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1536721 + ... + 1536732.

It is an arithmetic number, because the mean of its divisors is an integer number (4610181).

Almost surely, 2^18440718 is an apocalyptic number.

18440718 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18440718 is a wasteful number, since it uses less digits than its factorization.

18440718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073458.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 18440718 is about 4294.2657113877. The cubic root of 18440718 is about 264.1958200512.

The spelling of 18440718 in words is "eighteen million, four hundred forty thousand, seven hundred eighteen".