186135640 has 32 divisors (see below), whose sum is σ = 419514480. Its totient is φ = 74328192.

The previous prime is 186135637. The next prime is 186135661. The reversal of 186135640 is 46531681.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 186135596 and 186135605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22102 + ... + 29338.

Almost surely, 2^186135640 is an apocalyptic number.

186135640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

186135640 is an abundant number, since it is smaller than the sum of its proper divisors (233378840).

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

186135640 is a wasteful number, since it uses less digits than its factorization.

186135640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7891 (or 7887 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 186135640 is about 13643.1535943857. The cubic root of 186135640 is about 570.9654715795.

The spelling of 186135640 in words is "one hundred eighty-six million, one hundred thirty-five thousand, six hundred forty".