18418986 has 12 divisors (see below), whose sum is σ = 39907842. Its totient is φ = 6139656.

The previous prime is 18418979. The next prime is 18419017. The reversal of 18418986 is 68981481.

It can be written as a sum of positive squares in only one way, i.e., 9828225 + 8590761 = 3135^2 + 2931^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 511621 + ... + 511656.

Almost surely, 2^18418986 is an apocalyptic number.

18418986 is an abundant number, since it is smaller than the sum of its proper divisors (21488856).

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

18418986 is a wasteful number, since it uses less digits than its factorization.

18418986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023285 (or 1023282 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 18418986 is about 4291.7346143488. The cubic root of 18418986 is about 264.0919961753.

The spelling of 18418986 in words is "eighteen million, four hundred eighteen thousand, nine hundred eighty-six".