18242290 has 32 divisors (see below), whose sum is σ = 35997696. Its totient is φ = 6600960.

The previous prime is 18242281. The next prime is 18242293. The reversal of 18242290 is 9224281.

It is a super-2 number, since 2×18242290² = 665562288888200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18242293) 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 15 ways as a sum of consecutive naturals, for example, 41914 + ... + 42346.

It is an arithmetic number, because the mean of its divisors is an integer number (1124928).

Almost surely, 2^18242290 is an apocalyptic number.

18242290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18242290 is a deficient number, since it is larger than the sum of its proper divisors (17755406).

18242290 is a wasteful number, since it uses less digits than its factorization.

18242290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18242290 is about 4271.0993900868. The cubic root of 18242290 is about 263.2447903282.

Subtracting from 18242290 its reverse (9224281), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 1824 and 2290, that added together give a palindrome (4114).

The spelling of 18242290 in words is "eighteen million, two hundred forty-two thousand, two hundred ninety".