840345 has 24 divisors (see below), whose sum is σ = 1481088. Its totient is φ = 406560.

The previous prime is 840341. The next prime is 840347. The reversal of 840345 is 543048.

It is a happy number.

840345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 840345 - 2² = 840341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1584 + ... + 2046.

It is an arithmetic number, because the mean of its divisors is an integer number (61712).

2⁸⁴⁰³⁴⁵ is an apocalyptic number.

It is an amenable number.

840345 is a deficient number, since it is larger than the sum of its proper divisors (640743).

840345 is a wasteful number, since it uses less digits than its factorization.

840345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 840345 is about 916.7033326000. The cubic root of 840345 is about 94.3667953337.

It can be divided in two parts, 8403 and 45, that added together give a palindrome (8448).

The spelling of 840345 in words is "eight hundred forty thousand, three hundred forty-five".