6906421 has 2 divisors, whose sum is σ = 6906422. Its totient is φ = 6906420.

The previous prime is 6906407. The next prime is 6906461. The reversal of 6906421 is 1246096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6400900 + 505521 = 2530^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 6906421 - 2¹⁵ = 6873653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6906421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6906401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3453210 + 3453211.

It is an arithmetic number, because the mean of its divisors is an integer number (3453211).

Almost surely, 2^6906421 is an apocalyptic number.

It is an amenable number.

6906421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6906421 is an equidigital number, since it uses as much as digits as its factorization.

6906421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 6906421 is about 2628.0070395644. The cubic root of 6906421 is about 190.4368618018.

The spelling of 6906421 in words is "six million, nine hundred six thousand, four hundred twenty-one".