191870442 has 24 divisors (see below), whose sum is σ = 415979616. Its totient is φ = 63916776.

The previous prime is 191870423. The next prime is 191870443. The reversal of 191870442 is 244078191.

It is a junction number, because it is equal to n+sod(n) for n = 191870397 and 191870406.

It is not an unprimeable number, because it can be changed into a prime (191870443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45633 + ... + 49659.

It is an arithmetic number, because the mean of its divisors is an integer number (17332484).

Almost surely, 2^191870442 is an apocalyptic number.

191870442 is an abundant number, since it is smaller than the sum of its proper divisors (224109174).

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

191870442 is a wasteful number, since it uses less digits than its factorization.

191870442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6682 (or 6679 counting only the distinct ones).

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

The square root of 191870442 is about 13851.7306499946. The cubic root of 191870442 is about 576.7700385297.

The spelling of 191870442 in words is "one hundred ninety-one million, eight hundred seventy thousand, four hundred forty-two".