18087934 has 4 divisors (see below), whose sum is σ = 27131904. Its totient is φ = 9043966.

The previous prime is 18087899. The next prime is 18087977. The reversal of 18087934 is 43978081.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4521982 + ... + 4521985.

It is an arithmetic number, because the mean of its divisors is an integer number (6782976).

Almost surely, 2^18087934 is an apocalyptic number.

18087934 is a deficient number, since it is larger than the sum of its proper divisors (9043970).

18087934 is an equidigital number, since it uses as much as digits as its factorization.

18087934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9043969.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 18087934 is about 4252.9911826854. The cubic root of 18087934 is about 262.5002098260.

The spelling of 18087934 in words is "eighteen million, eighty-seven thousand, nine hundred thirty-four".