191689404 has 24 divisors (see below), whose sum is σ = 470816640. Its totient is φ = 60533424.

The previous prime is 191689397. The next prime is 191689409. The reversal of 191689404 is 404986191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191689409) 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, 420144 + ... + 420599.

It is an arithmetic number, because the mean of its divisors is an integer number (19617360).

Almost surely, 2^191689404 is an apocalyptic number.

It is an amenable number.

191689404 is an abundant number, since it is smaller than the sum of its proper divisors (279127236).

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

191689404 is a wasteful number, since it uses less digits than its factorization.

191689404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840769 (or 840767 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 191689404 is about 13845.1942564920. The cubic root of 191689404 is about 576.5885790144.

The spelling of 191689404 in words is "one hundred ninety-one million, six hundred eighty-nine thousand, four hundred four".