840231 has 12 divisors (see below), whose sum is σ = 1387152. Its totient is φ = 480096.

The previous prime is 840223. The next prime is 840239. The reversal of 840231 is 132048.

It is a happy number.

840231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (840223) and next prime (840239).

It is not a de Polignac number, because 840231 - 2³ = 840223 is a prime.

It is a super-2 number, since 2×840231² = 1411976266722, which contains 22 as substring.

840231 is a modest number, since divided by 231 gives 84 as remainder.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840231.

It is not an unprimeable number, because it can be changed into a prime (840239) 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, 6606 + ... + 6731.

It is an arithmetic number, because the mean of its divisors is an integer number (115596).

2⁸⁴⁰²³¹ is an apocalyptic number.

840231 is a deficient number, since it is larger than the sum of its proper divisors (546921).

840231 is a wasteful number, since it uses less digits than its factorization.

840231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13350 (or 13347 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 840231 is about 916.6411511600. The cubic root of 840231 is about 94.3625279192.

Adding to 840231 its reverse (132048), we get a palindrome (972279).

The spelling of 840231 in words is "eight hundred forty thousand, two hundred thirty-one".