829981 has 4 divisors (see below), whose sum is σ = 831964. Its totient is φ = 828000.

The previous prime is 829979. The next prime is 829987. The reversal of 829981 is 189928.

829981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 549081 + 280900 = 741^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 829981 - 2¹ = 829979 is a prime.

It is a super-2 number, since 2×829981² = 1377736920722, which contains 22 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 829981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (829987) 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, 90 + ... + 1291.

It is an arithmetic number, because the mean of its divisors is an integer number (207991).

2⁸²⁹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

829981 is a deficient number, since it is larger than the sum of its proper divisors (1983).

829981 is a wasteful number, since it uses less digits than its factorization.

829981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982.

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

The square root of 829981 is about 911.0329302501. The cubic root of 829981 is about 93.9772466431.

The spelling of 829981 in words is "eight hundred twenty-nine thousand, nine hundred eighty-one".