18240087 has 8 divisors (see below), whose sum is σ = 24363504. Its totient is φ = 12138368.

The previous prime is 18240077. The next prime is 18240091. The reversal of 18240087 is 78004281.

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 18240087 - 2⁴ = 18240071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3348 + ... + 6905.

It is an arithmetic number, because the mean of its divisors is an integer number (3045438).

Almost surely, 2^18240087 is an apocalyptic number.

18240087 is a deficient number, since it is larger than the sum of its proper divisors (6123417).

18240087 is a wasteful number, since it uses less digits than its factorization.

18240087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10849.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 18240087 is about 4270.8414861711. The cubic root of 18240087 is about 263.2341931276.

The spelling of 18240087 in words is "eighteen million, two hundred forty thousand, eighty-seven".