18289990 has 8 divisors (see below), whose sum is σ = 32922000. Its totient is φ = 7315992.

The previous prime is 18289987. The next prime is 18289993. The reversal of 18289990 is 9998281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18289987) and next prime (18289993).

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 18289990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18289993) by changing a digit.

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, 914490 + ... + 914509.

It is an arithmetic number, because the mean of its divisors is an integer number (4115250).

Almost surely, 2^18289990 is an apocalyptic number.

18289990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18289990 is a deficient number, since it is larger than the sum of its proper divisors (14632010).

18289990 is a wasteful number, since it uses less digits than its factorization.

18289990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829006.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 18289990 is about 4276.6797869375. The cubic root of 18289990 is about 263.4740350825.

The spelling of 18289990 in words is "eighteen million, two hundred eighty-nine thousand, nine hundred ninety".