191803973394 has 64 divisors (see below), whose sum is σ = 424981416960. Its totient is φ = 57221976000.

The previous prime is 191803973371. The next prime is 191803973399. The reversal of 191803973394 is 493379308191.

It is not an unprimeable number, because it can be changed into a prime (191803973399) 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 31 ways as a sum of consecutive naturals, for example, 3293509 + ... + 3351239.

It is an arithmetic number, because the mean of its divisors is an integer number (6640334640).

Almost surely, 2^191803973394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191803973394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212490708480).

191803973394 is an abundant number, since it is smaller than the sum of its proper divisors (233177443566).

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

191803973394 is a wasteful number, since it uses less digits than its factorization.

191803973394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58527.

The product of its (nonzero) digits is 4408992, while the sum is 57.

The spelling of 191803973394 in words is "one hundred ninety-one billion, eight hundred three million, nine hundred seventy-three thousand, three hundred ninety-four".