191890395192 has 32 divisors (see below), whose sum is σ = 479767219200. Its totient is φ = 63957967584.

The previous prime is 191890395143. The next prime is 191890395197. The reversal of 191890395192 is 291593098191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191890395197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53538 + ... + 621809.

It is an arithmetic number, because the mean of its divisors is an integer number (14992725600).

Almost surely, 2^191890395192 is an apocalyptic number.

191890395192 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

191890395192 is an abundant number, since it is smaller than the sum of its proper divisors (287876824008).

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

191890395192 is a wasteful number, since it uses less digits than its factorization.

191890395192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687195 (or 687191 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 57.

The spelling of 191890395192 in words is "one hundred ninety-one billion, eight hundred ninety million, three hundred ninety-five thousand, one hundred ninety-two".