186945681 has 32 divisors (see below), whose sum is σ = 275788800. Its totient is φ = 111930624.

The previous prime is 186945677. The next prime is 186945751. The reversal of 186945681 is 186549681.

It is not a de Polignac number, because 186945681 - 2² = 186945677 is a prime.

It is a super-2 number, since 2×186945681² = 69897375289107522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 186945681.

It is not an unprimeable number, because it can be changed into a prime (186945641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307680 + ... + 308286.

It is an arithmetic number, because the mean of its divisors is an integer number (8618400).

Almost surely, 2^186945681 is an apocalyptic number.

It is an amenable number.

186945681 is a deficient number, since it is larger than the sum of its proper divisors (88843119).

186945681 is a wasteful number, since it uses less digits than its factorization.

186945681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825.

The product of its digits is 414720, while the sum is 48.

The square root of 186945681 is about 13672.8080875876. The cubic root of 186945681 is about 571.7925317732.

The spelling of 186945681 in words is "one hundred eighty-six million, nine hundred forty-five thousand, six hundred eighty-one".