18042306 has 16 divisors (see below), whose sum is σ = 36195744. Its totient is φ = 5995584.

The previous prime is 18042293. The next prime is 18042319. The reversal of 18042306 is 60324081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18042293) and next prime (18042319).

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 7 ways as a sum of consecutive naturals, for example, 2440 + ... + 6483.

It is an arithmetic number, because the mean of its divisors is an integer number (2262234).

Almost surely, 2^18042306 is an apocalyptic number.

18042306 is an abundant number, since it is smaller than the sum of its proper divisors (18153438).

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

18042306 is a wasteful number, since it uses less digits than its factorization.

18042306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9265.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 18042306 is about 4247.6235708923. The cubic root of 18042306 is about 262.2792993019.

Adding to 18042306 its reverse (60324081), we get a palindrome (78366387).

It can be divided in two parts, 180 and 42306, that added together give a triangular number (42486 = T₂₉₁).

The spelling of 18042306 in words is "eighteen million, forty-two thousand, three hundred six".