6925639 has 4 divisors (see below), whose sum is σ = 7915024. Its totient is φ = 5936256.

The previous prime is 6925631. The next prime is 6925643. The reversal of 6925639 is 9365296.

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 6925639 - 2³ = 6925631 is a prime.

It is a Duffinian number.

6925639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6925631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494682 + ... + 494695.

It is an arithmetic number, because the mean of its divisors is an integer number (1978756).

Almost surely, 2^6925639 is an apocalyptic number.

6925639 is a deficient number, since it is larger than the sum of its proper divisors (989385).

6925639 is an equidigital number, since it uses as much as digits as its factorization.

6925639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989384.

The product of its digits is 87480, while the sum is 40.

The square root of 6925639 is about 2631.6608824087. The cubic root of 6925639 is about 190.6133365255.

The spelling of 6925639 in words is "six million, nine hundred twenty-five thousand, six hundred thirty-nine".