6939889 has 4 divisors (see below), whose sum is σ = 7570800. Its totient is φ = 6308980.

The previous prime is 6939887. The next prime is 6939901. The reversal of 6939889 is 9889396.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6939889 - 2¹ = 6939887 is a prime.

It is a super-3 number, since 3×6939889³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6939887) 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, 315439 + ... + 315460.

It is an arithmetic number, because the mean of its divisors is an integer number (1892700).

Almost surely, 2^6939889 is an apocalyptic number.

It is an amenable number.

6939889 is a deficient number, since it is larger than the sum of its proper divisors (630911).

6939889 is a wasteful number, since it uses less digits than its factorization.

6939889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630910.

The product of its digits is 839808, while the sum is 52.

The square root of 6939889 is about 2634.3669068678. The cubic root of 6939889 is about 190.7439805098.

The spelling of 6939889 in words is "six million, nine hundred thirty-nine thousand, eight hundred eighty-nine".