840331 has 2 divisors, whose sum is σ = 840332. Its totient is φ = 840330.

The previous prime is 840319. The next prime is 840341. The reversal of 840331 is 133048.

840331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840331 - 2⁵ = 840299 is a prime.

It is a super-2 number, since 2×840331² = 1412312379122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840299 and 840308.

It is not a weakly prime, because it can be changed into another prime (840341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420165 + 420166.

It is an arithmetic number, because the mean of its divisors is an integer number (420166).

2⁸⁴⁰³³¹ is an apocalyptic number.

840331 is a deficient number, since it is larger than the sum of its proper divisors (1).

840331 is an equidigital number, since it uses as much as digits as its factorization.

840331 is an evil number, because the sum of its binary digits is even.

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

The square root of 840331 is about 916.6956965100. The cubic root of 840331 is about 94.3662712860.

Adding to 840331 its reverse (133048), we get a palindrome (973379).

The spelling of 840331 in words is "eight hundred forty thousand, three hundred thirty-one".