18087942 has 24 divisors (see below), whose sum is σ = 37392408. Its totient is φ = 5832960.

The previous prime is 18087899. The next prime is 18087977. The reversal of 18087942 is 24978081.

It is a self number, because there is not a number n which added to its sum of digits gives 18087942.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4198 + ... + 7334.

It is an arithmetic number, because the mean of its divisors is an integer number (1558017).

Almost surely, 2^18087942 is an apocalyptic number.

18087942 is an abundant number, since it is smaller than the sum of its proper divisors (19304466).

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

18087942 is a wasteful number, since it uses less digits than its factorization.

18087942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3204 (or 3173 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 18087942 is about 4252.9921231999. The cubic root of 18087942 is about 262.5002485258.

The spelling of 18087942 in words is "eighteen million, eighty-seven thousand, nine hundred forty-two".