213688187 has 8 divisors (see below), whose sum is σ = 221160912. Its totient is φ = 206323200.

The previous prime is 213688169. The next prime is 213688207. The reversal of 213688187 is 781886312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213688187 - 2⁸ = 213687931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213688157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22889 + ... + 30842.

It is an arithmetic number, because the mean of its divisors is an integer number (27645114).

Almost surely, 2^213688187 is an apocalyptic number.

213688187 is a deficient number, since it is larger than the sum of its proper divisors (7472725).

213688187 is an equidigital number, since it uses as much as digits as its factorization.

213688187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53869.

The product of its digits is 129024, while the sum is 44.

The square root of 213688187 is about 14618.0774043648. The cubic root of 213688187 is about 597.8517499567.

The spelling of 213688187 in words is "two hundred thirteen million, six hundred eighty-eight thousand, one hundred eighty-seven".