18994087 has 8 divisors (see below), whose sum is σ = 22117536. Its totient is φ = 15973152.

The previous prime is 18994069. The next prime is 18994141. The reversal of 18994087 is 78049981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18994087 - 2¹⁹ = 18469799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994007) 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, 25228 + ... + 25969.

It is an arithmetic number, because the mean of its divisors is an integer number (2764692).

Almost surely, 2^18994087 is an apocalyptic number.

18994087 is a deficient number, since it is larger than the sum of its proper divisors (3123449).

18994087 is an equidigital number, since it uses as much as digits as its factorization.

18994087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51257.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 18994087 is about 4358.2206231443. The cubic root of 18994087 is about 266.8124808441.

The spelling of 18994087 in words is "eighteen million, nine hundred ninety-four thousand, eighty-seven".