6921829439 has 4 divisors (see below), whose sum is σ = 7910662224. Its totient is φ = 5932996656.

The previous prime is 6921829379. The next prime is 6921829457. The reversal of 6921829439 is 9349281296.

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 6921829439 - 2³² = 2626862143 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 (6921829339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494416382 + ... + 494416395.

It is an arithmetic number, because the mean of its divisors is an integer number (1977665556).

Almost surely, 2^6921829439 is an apocalyptic number.

6921829439 is a deficient number, since it is larger than the sum of its proper divisors (988832785).

6921829439 is an equidigital number, since it uses as much as digits as its factorization.

6921829439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988832784.

The product of its digits is 1679616, while the sum is 53.

The square root of 6921829439 is about 83197.5326497126. The cubic root of 6921829439 is about 1905.7838012084.

The spelling of 6921829439 in words is "six billion, nine hundred twenty-one million, eight hundred twenty-nine thousand, four hundred thirty-nine".