18693689 has 8 divisors (see below), whose sum is σ = 21508800. Its totient is φ = 15914736.

The previous prime is 18693673. The next prime is 18693707. The reversal of 18693689 is 98639681.

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 18693689 - 2⁴ = 18693673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18693889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7919 + ... + 10004.

It is an arithmetic number, because the mean of its divisors is an integer number (2688600).

Almost surely, 2^18693689 is an apocalyptic number.

It is an amenable number.

18693689 is a deficient number, since it is larger than the sum of its proper divisors (2815111).

18693689 is a wasteful number, since it uses less digits than its factorization.

18693689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18079.

The product of its digits is 559872, while the sum is 50.

The square root of 18693689 is about 4323.6198954117. The cubic root of 18693689 is about 265.3984228686.

The spelling of 18693689 in words is "eighteen million, six hundred ninety-three thousand, six hundred eighty-nine".