18870686 has 16 divisors (see below), whose sum is σ = 29880960. Its totient is φ = 8913240.

The previous prime is 18870647. The next prime is 18870689. The reversal of 18870686 is 68607881.

It is a super-2 number, since 2×18870686² = 712205580221192, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870689) 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, 23585 + ... + 24371.

It is an arithmetic number, because the mean of its divisors is an integer number (1867560).

Almost surely, 2^18870686 is an apocalyptic number.

18870686 is a deficient number, since it is larger than the sum of its proper divisors (11010274).

18870686 is a wasteful number, since it uses less digits than its factorization.

18870686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 18870686 is about 4344.0402852644. The cubic root of 18870686 is about 266.2334148823.

The spelling of 18870686 in words is "eighteen million, eight hundred seventy thousand, six hundred eighty-six".