18272087 has 4 divisors (see below), whose sum is σ = 18377880. Its totient is φ = 18166296.

The previous prime is 18272083. The next prime is 18272099. The reversal of 18272087 is 78027281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78027281 = 19 ⋅4106699.

It is a cyclic number.

It is not a de Polignac number, because 18272087 - 2² = 18272083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18272081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52637 + ... + 52982.

It is an arithmetic number, because the mean of its divisors is an integer number (4594470).

Almost surely, 2^18272087 is an apocalyptic number.

18272087 is a deficient number, since it is larger than the sum of its proper divisors (105793).

18272087 is a wasteful number, since it uses less digits than its factorization.

18272087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105792.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 18272087 is about 4274.5861788014. The cubic root of 18272087 is about 263.3880405842.

The spelling of 18272087 in words is "eighteen million, two hundred seventy-two thousand, eighty-seven".