18198513 has 12 divisors (see below), whose sum is σ = 27260688. Its totient is φ = 12132180.

The previous prime is 18198493. The next prime is 18198533. The reversal of 18198513 is 31589181.

It is an interprime number because it is at equal distance from previous prime (18198493) and next prime (18198533).

It is not a de Polignac number, because 18198513 - 2⁹ = 18198001 is a prime.

It is a super-2 number, since 2×18198513² = 662371750822338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18198533) 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, 37203 + ... + 37688.

It is an arithmetic number, because the mean of its divisors is an integer number (2271724).

Almost surely, 2^18198513 is an apocalyptic number.

It is an amenable number.

18198513 is a deficient number, since it is larger than the sum of its proper divisors (9062175).

18198513 is an frugal number, since it uses more digits than its factorization.

18198513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74906 (or 74894 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 18198513 is about 4265.9715188923. The cubic root of 18198513 is about 263.0340474554.

The spelling of 18198513 in words is "eighteen million, one hundred ninety-eight thousand, five hundred thirteen".