3967213 has 4 divisors (see below), whose sum is σ = 3971260. Its totient is φ = 3963168.

The previous prime is 3967207. The next prime is 3967231. The reversal of 3967213 is 3127693.

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 can be written as a sum of positive squares in 2 ways, for example, as 1841449 + 2125764 = 1357^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 3967213 - 2⁹ = 3966701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3967253) 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, 481 + ... + 2857.

It is an arithmetic number, because the mean of its divisors is an integer number (992815).

Almost surely, 2^3967213 is an apocalyptic number.

It is an amenable number.

3967213 is a deficient number, since it is larger than the sum of its proper divisors (4047).

3967213 is a wasteful number, since it uses less digits than its factorization.

3967213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4046.

The product of its digits is 6804, while the sum is 31.

The square root of 3967213 is about 1991.7863841286. The cubic root of 3967213 is about 158.3051970934.

The spelling of 3967213 in words is "three million, nine hundred sixty-seven thousand, two hundred thirteen".