3921279 has 4 divisors (see below), whose sum is σ = 5228376. Its totient is φ = 2614184.

The previous prime is 3921227. The next prime is 3921287. The reversal of 3921279 is 9721293.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3921279 - 2⁸ = 3921023 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653544 + ... + 653549.

It is an arithmetic number, because the mean of its divisors is an integer number (1307094).

Almost surely, 2^3921279 is an apocalyptic number.

3921279 is a deficient number, since it is larger than the sum of its proper divisors (1307097).

3921279 is a wasteful number, since it uses less digits than its factorization.

3921279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307096.

The product of its digits is 6804, while the sum is 33.

The square root of 3921279 is about 1980.2219572563. The cubic root of 3921279 is about 157.6918498622.

The spelling of 3921279 in words is "three million, nine hundred twenty-one thousand, two hundred seventy-nine".