191783994 has 32 divisors (see below), whose sum is σ = 391224384. Its totient is φ = 62663040.

The previous prime is 191783983. The next prime is 191784013. The reversal of 191783994 is 499387191.

It is a happy number.

It is a super-2 number, since 2×191783994² = 73562200709184072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74509 + ... + 77039.

It is an arithmetic number, because the mean of its divisors is an integer number (12225762).

Almost surely, 2^191783994 is an apocalyptic number.

191783994 is an abundant number, since it is smaller than the sum of its proper divisors (199440390).

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

191783994 is a wasteful number, since it uses less digits than its factorization.

191783994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2782.

The product of its digits is 489888, while the sum is 51.

The square root of 191783994 is about 13848.6098219280. The cubic root of 191783994 is about 576.6834034963.

The spelling of 191783994 in words is "one hundred ninety-one million, seven hundred eighty-three thousand, nine hundred ninety-four".