18088393986 has 80 divisors (see below), whose sum is σ = 43681131648. Its totient is φ = 5561589600.

The previous prime is 18088393963. The next prime is 18088394081. The reversal of 18088393986 is 68939388081.

18088393986 is a `hidden beast` number, since 1 + 80 + 88 + 393 + 98 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4233031 + ... + 4237301.

Almost surely, 2^18088393986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18088393986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21840565824).

18088393986 is an abundant number, since it is smaller than the sum of its proper divisors (25592737662).

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

18088393986 is a wasteful number, since it uses less digits than its factorization.

18088393986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6309 (or 6300 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 63.

The spelling of 18088393986 in words is "eighteen billion, eighty-eight million, three hundred ninety-three thousand, nine hundred eighty-six".