191399444 has 12 divisors (see below), whose sum is σ = 338266068. Its totient is φ = 94752000.

The previous prime is 191399431. The next prime is 191399459. The reversal of 191399444 is 444993191.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 180096400 + 11303044 = 13420^2 + 3362^2 .

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 191399395 and 191399404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236477 + ... + 237284.

It is an arithmetic number, because the mean of its divisors is an integer number (28188839).

Almost surely, 2^191399444 is an apocalyptic number.

It is an amenable number.

191399444 is a deficient number, since it is larger than the sum of its proper divisors (146866624).

191399444 is a wasteful number, since it uses less digits than its factorization.

191399444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473866 (or 473864 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 191399444 is about 13834.7187900586. The cubic root of 191399444 is about 576.2977057043.

The spelling of 191399444 in words is "one hundred ninety-one million, three hundred ninety-nine thousand, four hundred forty-four".