6921385 has 8 divisors (see below), whose sum is σ = 8369856. Its totient is φ = 5494320.

The previous prime is 6921353. The next prime is 6921389. The reversal of 6921385 is 5831296.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6921385 - 2⁵ = 6921353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6921385.

It is not an unprimeable number, because it can be changed into a prime (6921389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4629 + ... + 5938.

It is an arithmetic number, because the mean of its divisors is an integer number (1046232).

Almost surely, 2^6921385 is an apocalyptic number.

It is an amenable number.

6921385 is a deficient number, since it is larger than the sum of its proper divisors (1448471).

6921385 is a wasteful number, since it uses less digits than its factorization.

6921385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10703.

The product of its digits is 12960, while the sum is 34.

The square root of 6921385 is about 2630.8525234228. The cubic root of 6921385 is about 190.5743011280.

It can be divided in two parts, 692 and 1385, that multiplied together give a triangular number (958420 = T₁₃₈₄).

The spelling of 6921385 in words is "six million, nine hundred twenty-one thousand, three hundred eighty-five".