191784042 has 48 divisors (see below), whose sum is σ = 438966528. Its totient is φ = 60419520.

The previous prime is 191784041. The next prime is 191784077. The reversal of 191784042 is 240487191.

191784042 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×191784042² = 73562237531715528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 191783988 and 191784006.

It is not an unprimeable number, because it can be changed into a prime (191784041) 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, 19998 + ... + 27990.

It is an arithmetic number, because the mean of its divisors is an integer number (9145136).

Almost surely, 2^191784042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191784042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219483264).

191784042 is an abundant number, since it is smaller than the sum of its proper divisors (247182486).

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

191784042 is a wasteful number, since it uses less digits than its factorization.

191784042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8075 (or 8072 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 191784042 is about 13848.6115549538. The cubic root of 191784042 is about 576.6834516073.

It can be divided in two parts, 19178 and 4042, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 191784042 in words is "one hundred ninety-one million, seven hundred eighty-four thousand, forty-two".