18698849 has 8 divisors (see below), whose sum is σ = 20170920. Its totient is φ = 17231616.

The previous prime is 18698807. The next prime is 18698891. The reversal of 18698849 is 94889681.

It is an interprime number because it is at equal distance from previous prime (18698807) and next prime (18698891).

It can be written as a sum of positive squares in 4 ways, for example, as 1000000 + 17698849 = 1000^2 + 4207^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18698849 - 2²⁰ = 17650273 is a prime.

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 18698849.

It is not an unprimeable number, because it can be changed into a prime (18698899) 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 7 ways as a sum of consecutive naturals, for example, 13769 + ... + 15065.

It is an arithmetic number, because the mean of its divisors is an integer number (2521365).

Almost surely, 2^18698849 is an apocalyptic number.

It is an amenable number.

18698849 is a deficient number, since it is larger than the sum of its proper divisors (1472071).

18698849 is a wasteful number, since it uses less digits than its factorization.

18698849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419.

The product of its digits is 995328, while the sum is 53.

The square root of 18698849 is about 4324.2165764448. The cubic root of 18698849 is about 265.4228398412.

The spelling of 18698849 in words is "eighteen million, six hundred ninety-eight thousand, eight hundred forty-nine".