340831 has 4 divisors (see below), whose sum is σ = 342000. Its totient is φ = 339664.

The previous prime is 340819. The next prime is 340849. The reversal of 340831 is 138043.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340831 is a prime.

It is a super-2 number, since 2×340831² = 232331541122, which contains 22 as substring.

It is a Duffinian number.

340831 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 340799 and 340808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340801) 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, 270 + ... + 868.

It is an arithmetic number, because the mean of its divisors is an integer number (85500).

2³⁴⁰⁸³¹ is an apocalyptic number.

340831 is a deficient number, since it is larger than the sum of its proper divisors (1169).

340831 is an equidigital number, since it uses as much as digits as its factorization.

340831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 340831 is about 583.8073312318. The cubic root of 340831 is about 69.8521368637.

Adding to 340831 its reverse (138043), we get a palindrome (478874).

The spelling of 340831 in words is "three hundred forty thousand, eight hundred thirty-one".