6939021 has 4 divisors (see below), whose sum is σ = 9252032. Its totient is φ = 4626012.

The previous prime is 6939011. The next prime is 6939029. The reversal of 6939021 is 1209396.

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 not a de Polignac number, because 6939021 - 2⁹ = 6938509 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6939021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6939029) 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, 1156501 + ... + 1156506.

It is an arithmetic number, because the mean of its divisors is an integer number (2313008).

Almost surely, 2^6939021 is an apocalyptic number.

It is an amenable number.

6939021 is a deficient number, since it is larger than the sum of its proper divisors (2313011).

6939021 is a wasteful number, since it uses less digits than its factorization.

6939021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313010.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 6939021 is about 2634.2021562515. The cubic root of 6939021 is about 190.7360278044.

The spelling of 6939021 in words is "six million, nine hundred thirty-nine thousand, twenty-one".