18706887 has 12 divisors (see below), whose sum is σ = 28443480. Its totient is φ = 11814768.

The previous prime is 18706879. The next prime is 18706901. The reversal of 18706887 is 78860781.

It is not a de Polignac number, because 18706887 - 2³ = 18706879 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18706837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54528 + ... + 54869.

It is an arithmetic number, because the mean of its divisors is an integer number (2370290).

Almost surely, 2^18706887 is an apocalyptic number.

18706887 is a deficient number, since it is larger than the sum of its proper divisors (9736593).

18706887 is a wasteful number, since it uses less digits than its factorization.

18706887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109422 (or 109419 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 18706887 is about 4325.1458934931. The cubic root of 18706887 is about 265.4608664805.

The spelling of 18706887 in words is "eighteen million, seven hundred six thousand, eight hundred eighty-seven".