18874687 has 4 divisors (see below), whose sum is σ = 20326600. Its totient is φ = 17422776.

The previous prime is 18874649. The next prime is 18874703. The reversal of 18874687 is 78647881.

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

It is a cyclic number.

It is not a de Polignac number, because 18874687 - 2¹¹ = 18872639 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 18874687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18874787) 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, 725937 + ... + 725962.

It is an arithmetic number, because the mean of its divisors is an integer number (5081650).

Almost surely, 2^18874687 is an apocalyptic number.

18874687 is a deficient number, since it is larger than the sum of its proper divisors (1451913).

18874687 is a wasteful number, since it uses less digits than its factorization.

18874687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451912.

The product of its digits is 602112, while the sum is 49.

The square root of 18874687 is about 4344.5007768442. The cubic root of 18874687 is about 266.2522293303.

The spelling of 18874687 in words is "eighteen million, eight hundred seventy-four thousand, six hundred eighty-seven".