191889042 has 16 divisors (see below), whose sum is σ = 390070272. Its totient is φ = 62914320.

The previous prime is 191889031. The next prime is 191889043. The reversal of 191889042 is 240988191.

It is a junction number, because it is equal to n+sod(n) for n = 191888985 and 191889003.

It is not an unprimeable number, because it can be changed into a prime (191889043) 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 7 ways as a sum of consecutive naturals, for example, 261778 + ... + 262509.

It is an arithmetic number, because the mean of its divisors is an integer number (24379392).

Almost surely, 2^191889042 is an apocalyptic number.

191889042 is an abundant number, since it is smaller than the sum of its proper divisors (198181230).

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

191889042 is a wasteful number, since it uses less digits than its factorization.

191889042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524353.

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 191889042 is about 13852.4020299730. The cubic root of 191889042 is about 576.7886753695.

The spelling of 191889042 in words is "one hundred ninety-one million, eight hundred eighty-nine thousand, forty-two".