191940396242 has 16 divisors (see below), whose sum is σ = 346358610240. Its totient is φ = 77930687088.

The previous prime is 191940396229. The next prime is 191940396247. The reversal of 191940396242 is 242693049191.

It is a super-2 number, since 2×191940396242² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191940396247) 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, 360789953 + ... + 360790484.

It is an arithmetic number, because the mean of its divisors is an integer number (21647413140).

Almost surely, 2^191940396242 is an apocalyptic number.

191940396242 is a deficient number, since it is larger than the sum of its proper divisors (154418213998).

191940396242 is a wasteful number, since it uses less digits than its factorization.

191940396242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721580465.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 191940396242 in words is "one hundred ninety-one billion, nine hundred forty million, three hundred ninety-six thousand, two hundred forty-two".