18986870 has 16 divisors (see below), whose sum is σ = 39058848. Its totient is φ = 6509760.

The previous prime is 18986867. The next prime is 18986873. The reversal of 18986870 is 7868981.

It is an interprime number because it is at equal distance from previous prime (18986867) and next prime (18986873).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18986873) 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, 135551 + ... + 135690.

It is an arithmetic number, because the mean of its divisors is an integer number (2441178).

Almost surely, 2^18986870 is an apocalyptic number.

18986870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18986870 is an abundant number, since it is smaller than the sum of its proper divisors (20071978).

18986870 is a wasteful number, since it uses less digits than its factorization.

18986870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271255.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 18986870 is about 4357.3925689568. The cubic root of 18986870 is about 266.7786838418.

The spelling of 18986870 in words is "eighteen million, nine hundred eighty-six thousand, eight hundred seventy".