191040 has 56 divisors (see below), whose sum is σ = 609600. Its totient is φ = 50688.

The previous prime is 191039. The next prime is 191047. The reversal of 191040 is 40191.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (191047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 861 + ... + 1059.

2¹⁹¹⁰⁴⁰ is an apocalyptic number.

191040 is a gapful number since it is divisible by the number (10) 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 191040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304800).

191040 is an abundant number, since it is smaller than the sum of its proper divisors (418560).

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

191040 is a wasteful number, since it uses less digits than its factorization.

191040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 191040 is about 437.0812281487. The cubic root of 191040 is about 57.5936721444.

The spelling of 191040 in words is "one hundred ninety-one thousand, forty".