191868 has 24 divisors (see below), whose sum is σ = 456960. Its totient is φ = 62640.

The previous prime is 191861. The next prime is 191899. The reversal of 191868 is 868191.

191868 is nontrivially palindromic in base 15.

It is an Ulam number.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191861) by changing a digit.

191868 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 573 + ... + 843.

It is an arithmetic number, because the mean of its divisors is an integer number (19040).

2¹⁹¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

191868 is an abundant number, since it is smaller than the sum of its proper divisors (265092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191868 is a wasteful number, since it uses less digits than its factorization.

191868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 335 counting only the distinct ones).

The product of its digits is 3456, while the sum is 33.

The square root of 191868 is about 438.0273964035. The cubic root of 191868 is about 57.6767591604.

The spelling of 191868 in words is "one hundred ninety-one thousand, eight hundred sixty-eight".