18249942 has 16 divisors (see below), whose sum is σ = 38647152. Its totient is φ = 5725440.

The previous prime is 18249941. The next prime is 18249947. The reversal of 18249942 is 24994281.

It is a self number, because there is not a number n which added to its sum of digits gives 18249942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18249941) 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 7 ways as a sum of consecutive naturals, for example, 89359 + ... + 89562.

It is an arithmetic number, because the mean of its divisors is an integer number (2415447).

Almost surely, 2^18249942 is an apocalyptic number.

18249942 is an abundant number, since it is smaller than the sum of its proper divisors (20397210).

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

18249942 is a wasteful number, since it uses less digits than its factorization.

18249942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178943.

The product of its digits is 41472, while the sum is 39.

The square root of 18249942 is about 4271.9950842668. The cubic root of 18249942 is about 263.2815924978.

It can be divided in two parts, 18249 and 942, that added together give a palindrome (19191).

The spelling of 18249942 in words is "eighteen million, two hundred forty-nine thousand, nine hundred forty-two".