18098887 has 4 divisors (see below), whose sum is σ = 19051480. Its totient is φ = 17146296.

The previous prime is 18098879. The next prime is 18098891. The reversal of 18098887 is 78889081.

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 18098887 - 2³ = 18098879 is a prime.

It is a super-3 number, since 3×18098887³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18098887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18098827) 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, 476268 + ... + 476305.

It is an arithmetic number, because the mean of its divisors is an integer number (4762870).

Almost surely, 2^18098887 is an apocalyptic number.

18098887 is a deficient number, since it is larger than the sum of its proper divisors (952593).

18098887 is an equidigital number, since it uses as much as digits as its factorization.

18098887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952592.

The product of its (nonzero) digits is 258048, while the sum is 49.

The square root of 18098887 is about 4254.2786697629. The cubic root of 18098887 is about 262.5531840840.

The spelling of 18098887 in words is "eighteen million, ninety-eight thousand, eight hundred eighty-seven".