991936426 has 8 divisors (see below), whose sum is σ = 1602358884. Its totient is φ = 457816800.

The previous prime is 991936423. The next prime is 991936447. The reversal of 991936426 is 624639199.

It can be written as a sum of positive squares in 2 ways, for example, as 987530625 + 4405801 = 31425^2 + 2099^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 991936426.

It is not an unprimeable number, because it can be changed into a prime (991936423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19075675 + ... + 19075726.

Almost surely, 2^991936426 is an apocalyptic number.

991936426 is a deficient number, since it is larger than the sum of its proper divisors (610422458).

991936426 is a wasteful number, since it uses less digits than its factorization.

991936426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38151416.

The product of its digits is 629856, while the sum is 49.

The square root of 991936426 is about 31495.0222416178. The cubic root of 991936426 is about 997.3048848799.

The spelling of 991936426 in words is "nine hundred ninety-one million, nine hundred thirty-six thousand, four hundred twenty-six".