18384290 has 8 divisors (see below), whose sum is σ = 33091740. Its totient is φ = 7353712.

The previous prime is 18384257. The next prime is 18384299. The reversal of 18384290 is 9248381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17884441 + 499849 = 4229^2 + 707^2 .

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 18384290.

It is not an unprimeable number, because it can be changed into a prime (18384299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 919205 + ... + 919224.

Almost surely, 2^18384290 is an apocalyptic number.

18384290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18384290 is a deficient number, since it is larger than the sum of its proper divisors (14707450).

18384290 is a wasteful number, since it uses less digits than its factorization.

18384290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838436.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18384290 is about 4287.6905205483. The cubic root of 18384290 is about 263.9260678344.

The spelling of 18384290 in words is "eighteen million, three hundred eighty-four thousand, two hundred ninety".