991704 has 32 divisors (see below), whose sum is σ = 2833920. Its totient is φ = 283296.

The previous prime is 991703. The next prime is 991717. The reversal of 991704 is 407199.

991704 = T₁₄₅ + T₁₄₆ + ... + T₂₀₇.

991704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991704.

It is not an unprimeable number, because it can be changed into a prime (991703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2784 + ... + 3119.

It is an arithmetic number, because the mean of its divisors is an integer number (88560).

2⁹⁹¹⁷⁰⁴ is an apocalyptic number.

It is an amenable number.

991704 is an abundant number, since it is smaller than the sum of its proper divisors (1842216).

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

991704 is a wasteful number, since it uses less digits than its factorization.

991704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5919 (or 5915 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 991704 is about 995.8433611768. The cubic root of 991704 is about 99.7226984158.

The spelling of 991704 in words is "nine hundred ninety-one thousand, seven hundred four".