3979813 has 8 divisors (see below), whose sum is σ = 4074840. Its totient is φ = 3886080.

The previous prime is 3979771. The next prime is 3979837. The reversal of 3979813 is 3189793.

It can be written as a sum of positive squares in 4 ways, for example, as 47524 + 3932289 = 218^2 + 1983^2 .

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 3979813 - 2¹³ = 3971621 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3979883) 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, 8403 + ... + 8863.

It is an arithmetic number, because the mean of its divisors is an integer number (509355).

Almost surely, 2^3979813 is an apocalyptic number.

It is an amenable number.

3979813 is a deficient number, since it is larger than the sum of its proper divisors (95027).

3979813 is an equidigital number, since it uses as much as digits as its factorization.

3979813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647.

The product of its digits is 40824, while the sum is 40.

The square root of 3979813 is about 1994.9468664604. The cubic root of 3979813 is about 158.4726141621.

The spelling of 3979813 in words is "three million, nine hundred seventy-nine thousand, eight hundred thirteen".