18424087 has 4 divisors (see below), whose sum is σ = 20099016. Its totient is φ = 16749160.

The previous prime is 18424069. The next prime is 18424093. The reversal of 18424087 is 78042481.

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

It is a cyclic number.

It is not a de Polignac number, because 18424087 - 2¹⁵ = 18391319 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18424027) 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, 837448 + ... + 837469.

It is an arithmetic number, because the mean of its divisors is an integer number (5024754).

Almost surely, 2^18424087 is an apocalyptic number.

18424087 is a deficient number, since it is larger than the sum of its proper divisors (1674929).

18424087 is a wasteful number, since it uses less digits than its factorization.

18424087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674928.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 18424087 is about 4292.3288550622. The cubic root of 18424087 is about 264.1163733574.

It can be divided in two parts, 1842 and 4087, that added together give a square (5929 = 77²).

The spelling of 18424087 in words is "eighteen million, four hundred twenty-four thousand, eighty-seven".