6939869 has 4 divisors (see below), whose sum is σ = 6958560. Its totient is φ = 6921180.

The previous prime is 6939827. The next prime is 6939887. The reversal of 6939869 is 9689396.

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 6939869 - 2²⁰ = 5891293 is a prime.

It is a super-2 number, since 2×6939869² = 96323563474322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6933869) 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, 8777 + ... + 9534.

It is an arithmetic number, because the mean of its divisors is an integer number (1739640).

Almost surely, 2^6939869 is an apocalyptic number.

It is an amenable number.

6939869 is a deficient number, since it is larger than the sum of its proper divisors (18691).

6939869 is a wasteful number, since it uses less digits than its factorization.

6939869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18690.

The product of its digits is 629856, while the sum is 50.

The square root of 6939869 is about 2634.3631108866. The cubic root of 6939869 is about 190.7437972752.

The spelling of 6939869 in words is "six million, nine hundred thirty-nine thousand, eight hundred sixty-nine".