18189698 has 4 divisors (see below), whose sum is σ = 27284550. Its totient is φ = 9094848.

The previous prime is 18189683. The next prime is 18189701. The reversal of 18189698 is 89698181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9504889 + 8684809 = 3083^2 + 2947^2 .

It is a super-2 number, since 2×18189698² = 661730226662408, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4547423 + ... + 4547426.

Almost surely, 2^18189698 is an apocalyptic number.

18189698 is a deficient number, since it is larger than the sum of its proper divisors (9094852).

18189698 is an equidigital number, since it uses as much as digits as its factorization.

18189698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9094851.

The product of its digits is 248832, while the sum is 50.

The square root of 18189698 is about 4264.9382176064. The cubic root of 18189698 is about 262.9915710985.

The spelling of 18189698 in words is "eighteen million, one hundred eighty-nine thousand, six hundred ninety-eight".