830781 has 12 divisors (see below), whose sum is σ = 1371552. Its totient is φ = 474696.

The previous prime is 830777. The next prime is 830789. The reversal of 830781 is 187038.

It is not a de Polignac number, because 830781 - 2² = 830777 is a prime.

It is a super-2 number, since 2×830781² = 1380394139922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (830789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6531 + ... + 6656.

It is an arithmetic number, because the mean of its divisors is an integer number (114296).

2⁸³⁰⁷⁸¹ is an apocalyptic number.

It is an amenable number.

830781 is a deficient number, since it is larger than the sum of its proper divisors (540771).

830781 is a wasteful number, since it uses less digits than its factorization.

830781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13200 (or 13197 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 830781 is about 911.4718865659. The cubic root of 830781 is about 94.0074311312.

The spelling of 830781 in words is "eight hundred thirty thousand, seven hundred eighty-one".