991694 has 8 divisors (see below), whose sum is σ = 1622808. Its totient is φ = 450760.

The previous prime is 991693. The next prime is 991703. The reversal of 991694 is 496199.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991693) 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, 22517 + ... + 22560.

It is an arithmetic number, because the mean of its divisors is an integer number (202851).

2⁹⁹¹⁶⁹⁴ is an apocalyptic number.

991694 is a deficient number, since it is larger than the sum of its proper divisors (631114).

991694 is a wasteful number, since it uses less digits than its factorization.

991694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45090.

The product of its digits is 17496, while the sum is 38.

The square root of 991694 is about 995.8383402942. The cubic root of 991694 is about 99.7223632249.

The spelling of 991694 in words is "nine hundred ninety-one thousand, six hundred ninety-four".