780831 has 12 divisors (see below), whose sum is σ = 1140360. Its totient is φ = 514800.

The previous prime is 780823. The next prime is 780833. The reversal of 780831 is 138087.

It is not a de Polignac number, because 780831 - 2³ = 780823 is a prime.

It is a super-2 number, since 2×780831² = 1219394101122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 780795 and 780804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 480 + ... + 1338.

It is an arithmetic number, because the mean of its divisors is an integer number (95030).

2⁷⁸⁰⁸³¹ is an apocalyptic number.

780831 is a deficient number, since it is larger than the sum of its proper divisors (359529).

780831 is a wasteful number, since it uses less digits than its factorization.

780831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966 (or 963 counting only the distinct ones).

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

The square root of 780831 is about 883.6464225017. The cubic root of 780831 is about 92.0843193568.

The spelling of 780831 in words is "seven hundred eighty thousand, eight hundred thirty-one".