18427986 has 40 divisors (see below), whose sum is σ = 43472880. Its totient is φ = 5818392.

The previous prime is 18427973. The next prime is 18427987. The reversal of 18427986 is 68972481.

It is not an unprimeable number, because it can be changed into a prime (18427987) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 85 + ... + 6071.

It is an arithmetic number, because the mean of its divisors is an integer number (1086822).

Almost surely, 2^18427986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18427986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21736440).

18427986 is an abundant number, since it is smaller than the sum of its proper divisors (25044894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18427986 is a wasteful number, since it uses less digits than its factorization.

18427986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6020 (or 6011 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 18427986 is about 4292.7830133842. The cubic root of 18427986 is about 264.1350032649.

The spelling of 18427986 in words is "eighteen million, four hundred twenty-seven thousand, nine hundred eighty-six".