6736421 has 4 divisors (see below), whose sum is σ = 6752844. Its totient is φ = 6720000.

The previous prime is 6736417. The next prime is 6736441. The reversal of 6736421 is 1246376.

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 2280100 + 4456321 = 1510^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 6736421 - 2² = 6736417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6736441) 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 in 3 ways as a sum of consecutive naturals, for example, 7580 + ... + 8421.

It is an arithmetic number, because the mean of its divisors is an integer number (1688211).

Almost surely, 2^6736421 is an apocalyptic number.

It is an amenable number.

6736421 is a deficient number, since it is larger than the sum of its proper divisors (16423).

6736421 is a wasteful number, since it uses less digits than its factorization.

6736421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16422.

The product of its digits is 6048, while the sum is 29.

The square root of 6736421 is about 2595.4616159751. The cubic root of 6736421 is about 188.8613430163.

It can be divided in two parts, 6736 and 421, that multiplied together give a square (2835856 = 1684²).

The spelling of 6736421 in words is "six million, seven hundred thirty-six thousand, four hundred twenty-one".