208027891 has 4 divisors (see below), whose sum is σ = 213101784. Its totient is φ = 202954000.

The previous prime is 208027877. The next prime is 208027931. The reversal of 208027891 is 198720802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 208027891 - 2²⁵ = 174473459 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 208027891.

It is not an unprimeable number, because it can be changed into a prime (208027871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2536885 + ... + 2536966.

It is an arithmetic number, because the mean of its divisors is an integer number (53275446).

Almost surely, 2^208027891 is an apocalyptic number.

208027891 is a deficient number, since it is larger than the sum of its proper divisors (5073893).

208027891 is an equidigital number, since it uses as much as digits as its factorization.

208027891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5073892.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 208027891 is about 14423.1720158916. The cubic root of 208027891 is about 592.5256955036.

The spelling of 208027891 in words is "two hundred eight million, twenty-seven thousand, eight hundred ninety-one".