6894421 has 2 divisors, whose sum is σ = 6894422. Its totient is φ = 6894420.

The previous prime is 6894343. The next prime is 6894427. The reversal of 6894421 is 1244986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6687396 + 207025 = 2586^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 6894421 - 2¹⁷ = 6763349 is a prime.

6894421 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6894427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3447210 + 3447211.

It is an arithmetic number, because the mean of its divisors is an integer number (3447211).

Almost surely, 2^6894421 is an apocalyptic number.

It is an amenable number.

6894421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6894421 is an equidigital number, since it uses as much as digits as its factorization.

6894421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 6894421 is about 2625.7229480659. The cubic root of 6894421 is about 190.3265023181.

The spelling of 6894421 in words is "six million, eight hundred ninety-four thousand, four hundred twenty-one".