186916993 has 12 divisors (see below), whose sum is σ = 191752704. Its totient is φ = 182194800.

The previous prime is 186916987. The next prime is 186916997. The reversal of 186916993 is 399619681.

It is a de Polignac number, because none of the positive numbers 2^k-186916993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 186916993.

It is not an unprimeable number, because it can be changed into a prime (186916997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 710580 + ... + 710842.

It is an arithmetic number, because the mean of its divisors is an integer number (15979392).

Almost surely, 2^186916993 is an apocalyptic number.

It is an amenable number.

186916993 is a deficient number, since it is larger than the sum of its proper divisors (4835711).

186916993 is an equidigital number, since it uses as much as digits as its factorization.

186916993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 515 counting only the distinct ones).

The product of its digits is 629856, while the sum is 52.

The square root of 186916993 is about 13671.7589577933. The cubic root of 186916993 is about 571.7632818805.

The spelling of 186916993 in words is "one hundred eighty-six million, nine hundred sixteen thousand, nine hundred ninety-three".