191690856 has 96 divisors (see below), whose sum is σ = 612518400. Its totient is φ = 52997760.

The previous prime is 191690843. The next prime is 191690857. The reversal of 191690856 is 658096191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191690857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9490 + ... + 21758.

It is an arithmetic number, because the mean of its divisors is an integer number (6380400).

Almost surely, 2^191690856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191690856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306259200).

191690856 is an abundant number, since it is smaller than the sum of its proper divisors (420827544).

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

191690856 is a wasteful number, since it uses less digits than its factorization.

191690856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12319 (or 12312 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 191690856 is about 13845.2466933601. The cubic root of 191690856 is about 576.5900348495.

The spelling of 191690856 in words is "one hundred ninety-one million, six hundred ninety thousand, eight hundred fifty-six".