186997 has 4 divisors (see below), whose sum is σ = 189856. Its totient is φ = 184140.

The previous prime is 186959. The next prime is 187003. The reversal of 186997 is 799681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 799681 = 37 ⋅21613.

It is a cyclic number.

It is not a de Polignac number, because 186997 - 2⁷ = 186869 is a prime.

It is a Duffinian number.

186997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (186917) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1329 + ... + 1462.

It is an arithmetic number, because the mean of its divisors is an integer number (47464).

2¹⁸⁶⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

186997 is a deficient number, since it is larger than the sum of its proper divisors (2859).

186997 is an equidigital number, since it uses as much as digits as its factorization.

186997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858.

The product of its digits is 27216, while the sum is 40.

The square root of 186997 is about 432.4314974652. The cubic root of 186997 is about 57.1844848461.

The spelling of 186997 in words is "one hundred eighty-six thousand, nine hundred ninety-seven".