186999642 has 12 divisors (see below), whose sum is σ = 405165930. Its totient is φ = 62333208.

The previous prime is 186999629. The next prime is 186999671. The reversal of 186999642 is 246999681.

186999642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 129072321 + 57927321 = 11361^2 + 7611^2 .

It is a super-2 number, since 2×186999642² = 69937732216256328, which contains 22 as substring.

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, 5194417 + ... + 5194452.

Almost surely, 2^186999642 is an apocalyptic number.

186999642 is an abundant number, since it is smaller than the sum of its proper divisors (218166288).

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

186999642 is a wasteful number, since it uses less digits than its factorization.

186999642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10388877 (or 10388874 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 186999642 is about 13674.7812413947. The cubic root of 186999642 is about 571.8475415643.

The spelling of 186999642 in words is "one hundred eighty-six million, nine hundred ninety-nine thousand, six hundred forty-two".