6729421 has 4 divisors (see below), whose sum is σ = 6961500. Its totient is φ = 6497344.

The previous prime is 6729419. The next prime is 6729427. The reversal of 6729421 is 1249276.

6729421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 4056196 + 2673225 = 2014^2 + 1635^2 .

It is a cyclic number.

It is not a de Polignac number, because 6729421 - 2¹ = 6729419 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6729427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115996 + ... + 116053.

It is an arithmetic number, because the mean of its divisors is an integer number (1740375).

Almost surely, 2^6729421 is an apocalyptic number.

It is an amenable number.

6729421 is a deficient number, since it is larger than the sum of its proper divisors (232079).

6729421 is a wasteful number, since it uses less digits than its factorization.

6729421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232078.

The product of its digits is 6048, while the sum is 31.

The square root of 6729421 is about 2594.1127577652. The cubic root of 6729421 is about 188.7959033422.

The spelling of 6729421 in words is "six million, seven hundred twenty-nine thousand, four hundred twenty-one".