191856 has 40 divisors (see below), whose sum is σ = 567424. Its totient is φ = 54720.

The previous prime is 191837. The next prime is 191861. The reversal of 191856 is 658191.

It is a happy number.

It is a zygodrome in base 5.

It is a congruent number.

It is an unprimeable number.

191856 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, 51 + ... + 621.

2¹⁹¹⁸⁵⁶ is an apocalyptic number.

191856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283712).

191856 is an abundant number, since it is smaller than the sum of its proper divisors (375568).

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

191856 is a wasteful number, since it uses less digits than its factorization.

191856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589 (or 583 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 191856 is about 438.0136984159. The cubic root of 191856 is about 57.6755567095.

It can be divided in two parts, 19185 and 6, that added together give a palindrome (19191).

The spelling of 191856 in words is "one hundred ninety-one thousand, eight hundred fifty-six".