18098986 has 4 divisors (see below), whose sum is σ = 27148482. Its totient is φ = 9049492.

The previous prime is 18098923. The next prime is 18099007. The reversal of 18098986 is 68989081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68989081 = 7 ⋅9855583.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 78961 = 4245^2 + 281^2 .

It is a super-3 number, since 3×18098986³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4524745 + ... + 4524748.

Almost surely, 2^18098986 is an apocalyptic number.

18098986 is a deficient number, since it is larger than the sum of its proper divisors (9049496).

18098986 is an equidigital number, since it uses as much as digits as its factorization.

18098986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9049495.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 18098986 is about 4254.2903050920. The cubic root of 18098986 is about 262.5536628007.

The spelling of 18098986 in words is "eighteen million, ninety-eight thousand, nine hundred eighty-six".