18354987 has 12 divisors (see below), whose sum is σ = 30300400. Its totient is φ = 10488528.

The previous prime is 18354983. The next prime is 18355009. The reversal of 18354987 is 78945381.

It is not a de Polignac number, because 18354987 - 2² = 18354983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18354983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145612 + ... + 145737.

Almost surely, 2^18354987 is an apocalyptic number.

18354987 is a deficient number, since it is larger than the sum of its proper divisors (11945413).

18354987 is a wasteful number, since it uses less digits than its factorization.

18354987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291362 (or 291359 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 18354987 is about 4284.2720501854. The cubic root of 18354987 is about 263.7857680054.

The spelling of 18354987 in words is "eighteen million, three hundred fifty-four thousand, nine hundred eighty-seven".