18699998 has 8 divisors (see below), whose sum is σ = 28077192. Its totient is φ = 9340936.

The previous prime is 18699997. The next prime is 18700001. The reversal of 18699998 is 89999681.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18699997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1565 + ... + 6312.

It is an arithmetic number, because the mean of its divisors is an integer number (3509649).

Almost surely, 2^18699998 is an apocalyptic number.

18699998 is a deficient number, since it is larger than the sum of its proper divisors (9377194).

18699998 is a wasteful number, since it uses less digits than its factorization.

18699998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9066.

The product of its digits is 2519424, while the sum is 59.

The square root of 18699998 is about 4324.3494308393. The cubic root of 18699998 is about 265.4282762649.

The spelling of 18699998 in words is "eighteen million, six hundred ninety-nine thousand, nine hundred ninety-eight".