18498887 has 4 divisors (see below), whose sum is σ = 20180616. Its totient is φ = 16817160.

The previous prime is 18498863. The next prime is 18498937. The reversal of 18498887 is 78889481.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18498887 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 (18498817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840848 + ... + 840869.

It is an arithmetic number, because the mean of its divisors is an integer number (5045154).

Almost surely, 2^18498887 is an apocalyptic number.

18498887 is a deficient number, since it is larger than the sum of its proper divisors (1681729).

18498887 is a wasteful number, since it uses less digits than its factorization.

18498887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681728.

The product of its digits is 1032192, while the sum is 53.

The square root of 18498887 is about 4301.0332479533. The cubic root of 18498887 is about 264.4733196597.

The spelling of 18498887 in words is "eighteen million, four hundred ninety-eight thousand, eight hundred eighty-seven".