991736 has 16 divisors (see below), whose sum is σ = 1895400. Its totient is φ = 486304.

The previous prime is 991733. The next prime is 991741. The reversal of 991736 is 637199.

It is a junction number, because it is equal to n+sod(n) for n = 991696 and 991705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991733) by changing a digit.

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, 746 + ... + 1593.

2⁹⁹¹⁷³⁶ is an apocalyptic number.

It is an amenable number.

991736 is a deficient number, since it is larger than the sum of its proper divisors (903664).

991736 is a wasteful number, since it uses less digits than its factorization.

991736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398 (or 2394 counting only the distinct ones).

The product of its digits is 10206, while the sum is 35.

The square root of 991736 is about 995.8594278311. The cubic root of 991736 is about 99.7237710114.

The spelling of 991736 in words is "nine hundred ninety-one thousand, seven hundred thirty-six".