18418490 has 8 divisors (see below), whose sum is σ = 33153300. Its totient is φ = 7367392.

The previous prime is 18418487. The next prime is 18418537. The reversal of 18418490 is 9481481.

It can be written as a sum of positive squares in 2 ways, for example, as 16736281 + 1682209 = 4091^2 + 1297^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 18418490.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920915 + ... + 920934.

Almost surely, 2^18418490 is an apocalyptic number.

18418490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18418490 is a deficient number, since it is larger than the sum of its proper divisors (14734810).

18418490 is a wasteful number, since it uses less digits than its factorization.

18418490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841856.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 18418490 is about 4291.6768284669. The cubic root of 18418490 is about 264.0896255995.

The spelling of 18418490 in words is "eighteen million, four hundred eighteen thousand, four hundred ninety".