191912 has 32 divisors (see below), whose sum is σ = 432000. Its totient is φ = 78144.

The previous prime is 191911. The next prime is 191929. The reversal of 191912 is 219191.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1214 + ... + 1362.

It is an arithmetic number, because the mean of its divisors is an integer number (13500).

2¹⁹¹⁹¹² 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 191912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216000).

191912 is an abundant number, since it is smaller than the sum of its proper divisors (240088).

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

191912 is a wasteful number, since it uses less digits than its factorization.

191912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 181 counting only the distinct ones).

The product of its digits is 162, while the sum is 23.

The square root of 191912 is about 438.0776186933. The cubic root of 191912 is about 57.6811677180.

The spelling of 191912 in words is "one hundred ninety-one thousand, nine hundred twelve".