840311 has 4 divisors (see below), whose sum is σ = 849072. Its totient is φ = 831552.

The previous prime is 840299. The next prime is 840319. The reversal of 840311 is 113048.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 840311 - 2¹⁸ = 578167 is a prime.

It is a super-2 number, since 2×840311² = 1412245153442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 840311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840319) 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, 4235 + ... + 4428.

It is an arithmetic number, because the mean of its divisors is an integer number (212268).

2⁸⁴⁰³¹¹ is an apocalyptic number.

840311 is a deficient number, since it is larger than the sum of its proper divisors (8761).

840311 is an equidigital number, since it uses as much as digits as its factorization.

840311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8760.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 840311 is about 916.6847876997. The cubic root of 840311 is about 94.3655226364.

Adding to 840311 its reverse (113048), we get a palindrome (953359).

The spelling of 840311 in words is "eight hundred forty thousand, three hundred eleven".