18198693 has 6 divisors (see below), whose sum is σ = 26287014. Its totient is φ = 12132456.

The previous prime is 18198683. The next prime is 18198701. The reversal of 18198693 is 39689181.

It can be written as a sum of positive squares in only one way, i.e., 15233409 + 2965284 = 3903^2 + 1722^2 .

It is not a de Polignac number, because 18198693 - 2¹⁴ = 18182309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198613) 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 5 ways as a sum of consecutive naturals, for example, 1011030 + ... + 1011047.

It is an arithmetic number, because the mean of its divisors is an integer number (4381169).

Almost surely, 2^18198693 is an apocalyptic number.

It is an amenable number.

18198693 is a deficient number, since it is larger than the sum of its proper divisors (8088321).

18198693 is a wasteful number, since it uses less digits than its factorization.

18198693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022083 (or 2022080 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 18198693 is about 4265.9926160274. The cubic root of 18198693 is about 263.0349146686.

The spelling of 18198693 in words is "eighteen million, one hundred ninety-eight thousand, six hundred ninety-three".