6921379 has 4 divisors (see below), whose sum is σ = 6926760. Its totient is φ = 6916000.

The previous prime is 6921353. The next prime is 6921389. The reversal of 6921379 is 9731296.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6921379 - 2⁵ = 6921347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6921319) 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, 504 + ... + 3754.

It is an arithmetic number, because the mean of its divisors is an integer number (1731690).

Almost surely, 2^6921379 is an apocalyptic number.

6921379 is a deficient number, since it is larger than the sum of its proper divisors (5381).

6921379 is a wasteful number, since it uses less digits than its factorization.

6921379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5380.

The product of its digits is 20412, while the sum is 37.

The square root of 6921379 is about 2630.8513831078. The cubic root of 6921379 is about 190.5742460598.

The spelling of 6921379 in words is "six million, nine hundred twenty-one thousand, three hundred seventy-nine".