6921939 has 8 divisors (see below), whose sum is σ = 9385920. Its totient is φ = 4536296.

The previous prime is 6921917. The next prime is 6921949. The reversal of 6921939 is 9391296.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6921939 - 2¹⁵ = 6889171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6921897 and 6921906.

It is not an unprimeable number, because it can be changed into a prime (6921949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19377 + ... + 19730.

It is an arithmetic number, because the mean of its divisors is an integer number (1173240).

Almost surely, 2^6921939 is an apocalyptic number.

6921939 is a deficient number, since it is larger than the sum of its proper divisors (2463981).

6921939 is a wasteful number, since it uses less digits than its factorization.

6921939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39169.

The product of its digits is 26244, while the sum is 39.

The square root of 6921939 is about 2630.9578103801. The cubic root of 6921939 is about 190.5793856280.

The spelling of 6921939 in words is "six million, nine hundred twenty-one thousand, nine hundred thirty-nine".