6840355 has 4 divisors (see below), whose sum is σ = 8208432. Its totient is φ = 5472280.

The previous prime is 6840349. The next prime is 6840359. The reversal of 6840355 is 5530486.

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

It is not a de Polignac number, because 6840355 - 2⁹ = 6839843 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6840359) 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, 684031 + ... + 684040.

It is an arithmetic number, because the mean of its divisors is an integer number (2052108).

Almost surely, 2^6840355 is an apocalyptic number.

6840355 is a deficient number, since it is larger than the sum of its proper divisors (1368077).

6840355 is a wasteful number, since it uses less digits than its factorization.

6840355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368076.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 6840355 is about 2615.4072340651. The cubic root of 6840355 is about 189.8276831029.

The spelling of 6840355 in words is "six million, eight hundred forty thousand, three hundred fifty-five".