6921894 has 32 divisors (see below), whose sum is σ = 16369920. Its totient is φ = 1909152.

The previous prime is 6921883. The next prime is 6921917. The reversal of 6921894 is 4981296.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1624 + ... + 4059.

It is an arithmetic number, because the mean of its divisors is an integer number (511560).

Almost surely, 2^6921894 is an apocalyptic number.

6921894 is an abundant number, since it is smaller than the sum of its proper divisors (9448026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6921894 is a wasteful number, since it uses less digits than its factorization.

6921894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5724.

The product of its digits is 31104, while the sum is 39.

The square root of 6921894 is about 2630.9492583476. The cubic root of 6921894 is about 190.5789726372.

The spelling of 6921894 in words is "six million, nine hundred twenty-one thousand, eight hundred ninety-four".