840355 has 4 divisors (see below), whose sum is σ = 1008432. Its totient is φ = 672280.

The previous prime is 840353. The next prime is 840439. The reversal of 840355 is 553048.

It is a happy number.

840355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 840355 - 2¹ = 840353 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (840353) 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, 84031 + ... + 84040.

It is an arithmetic number, because the mean of its divisors is an integer number (252108).

2⁸⁴⁰³⁵⁵ is an apocalyptic number.

840355 is a deficient number, since it is larger than the sum of its proper divisors (168077).

840355 is a wasteful number, since it uses less digits than its factorization.

840355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168076.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 840355 is about 916.7087869111. The cubic root of 840355 is about 94.3671696499.

The spelling of 840355 in words is "eight hundred forty thousand, three hundred fifty-five".