828991 has 4 divisors (see below), whose sum is σ = 841432. Its totient is φ = 816552.

The previous prime is 828977. The next prime is 829001. The reversal of 828991 is 199828.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-828991 is a prime.

It is a super-3 number, since 3×828991³ = 1709112701083338813, which contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 828991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (828901) 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, 6120 + ... + 6253.

It is an arithmetic number, because the mean of its divisors is an integer number (210358).

2⁸²⁸⁹⁹¹ is an apocalyptic number.

828991 is a deficient number, since it is larger than the sum of its proper divisors (12441).

828991 is a wasteful number, since it uses less digits than its factorization.

828991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12440.

The product of its digits is 10368, while the sum is 37.

The square root of 828991 is about 910.4894288239. The cubic root of 828991 is about 93.9398664740.

The spelling of 828991 in words is "eight hundred twenty-eight thousand, nine hundred ninety-one".