6890305 has 4 divisors (see below), whose sum is σ = 8268372. Its totient is φ = 5512240.

The previous prime is 6890269. The next prime is 6890309. The reversal of 6890305 is 5030986.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1979649 + 4910656 = 1407^2 + 2216^2 .

It is not a de Polignac number, because 6890305 - 2⁹ = 6889793 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 (6890309) 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, 689026 + ... + 689035.

It is an arithmetic number, because the mean of its divisors is an integer number (2067093).

Almost surely, 2^6890305 is an apocalyptic number.

It is an amenable number.

6890305 is a deficient number, since it is larger than the sum of its proper divisors (1378067).

6890305 is a wasteful number, since it uses less digits than its factorization.

6890305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378066.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 6890305 is about 2624.9390469114. The cubic root of 6890305 is about 190.2886195222.

The spelling of 6890305 in words is "six million, eight hundred ninety thousand, three hundred five".