191086740 has 144 divisors (see below), whose sum is σ = 630110208. Its totient is φ = 46593792.

The previous prime is 191086739. The next prime is 191086757. The reversal of 191086740 is 47680191.

191086740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 191086695 and 191086704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 296859 + ... + 297501.

Almost surely, 2^191086740 is an apocalyptic number.

191086740 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 191086740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315055104).

191086740 is an abundant number, since it is smaller than the sum of its proper divisors (439023468).

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

191086740 is a wasteful number, since it uses less digits than its factorization.

191086740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 191086740 is about 13823.4127479433. The cubic root of 191086740 is about 575.9836873274.

The spelling of 191086740 in words is "one hundred ninety-one million, eighty-six thousand, seven hundred forty".