6906385 has 4 divisors (see below), whose sum is σ = 8287668. Its totient is φ = 5525104.

The previous prime is 6906343. The next prime is 6906401. The reversal of 6906385 is 5836096.

It is a Cunningham number, because it is equal to 2628²+1.

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 2483776 + 4422609 = 1576^2 + 2103^2 .

It is a cyclic number.

It is not a de Polignac number, because 6906385 - 2⁷ = 6906257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690634 + ... + 690643.

It is an arithmetic number, because the mean of its divisors is an integer number (2071917).

Almost surely, 2^6906385 is an apocalyptic number.

It is an amenable number.

6906385 is a deficient number, since it is larger than the sum of its proper divisors (1381283).

6906385 is a wasteful number, since it uses less digits than its factorization.

6906385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381282.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 6906385 is about 2628.0001902587. Note that the first 3 decimals coincide. The cubic root of 6906385 is about 190.4365309146.

The spelling of 6906385 in words is "six million, nine hundred six thousand, three hundred eighty-five".