3979421 has 4 divisors (see below), whose sum is σ = 3985212. Its totient is φ = 3973632.

The previous prime is 3979363. The next prime is 3979427. The reversal of 3979421 is 1249793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1249793 = 53 ⋅23581.

It can be written as a sum of positive squares in 2 ways, for example, as 1653796 + 2325625 = 1286^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 3979421 - 2⁶ = 3979357 is a prime.

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 (3979427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1700 + ... + 3293.

It is an arithmetic number, because the mean of its divisors is an integer number (996303).

Almost surely, 2^3979421 is an apocalyptic number.

It is an amenable number.

3979421 is a deficient number, since it is larger than the sum of its proper divisors (5791).

3979421 is an equidigital number, since it uses as much as digits as its factorization.

3979421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5790.

The product of its digits is 13608, while the sum is 35.

The square root of 3979421 is about 1994.8486158102. The cubic root of 3979421 is about 158.4674109608.

The spelling of 3979421 in words is "three million, nine hundred seventy-nine thousand, four hundred twenty-one".