6723391 has 4 divisors (see below), whose sum is σ = 6758784. Its totient is φ = 6688000.

The previous prime is 6723371. The next prime is 6723403. The reversal of 6723391 is 1933276.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6723391 - 2⁹ = 6722879 is a prime.

It is a Duffinian number.

6723391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6723371) 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, 17410 + ... + 17791.

It is an arithmetic number, because the mean of its divisors is an integer number (1689696).

Almost surely, 2^6723391 is an apocalyptic number.

6723391 is a deficient number, since it is larger than the sum of its proper divisors (35393).

6723391 is a wasteful number, since it uses less digits than its factorization.

6723391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35392.

The product of its digits is 6804, while the sum is 31.

The square root of 6723391 is about 2592.9502501976. The cubic root of 6723391 is about 188.7394953439.

The spelling of 6723391 in words is "six million, seven hundred twenty-three thousand, three hundred ninety-one".