3861213 has 4 divisors (see below), whose sum is σ = 5148288. Its totient is φ = 2574140.

The previous prime is 3861211. The next prime is 3861223. The reversal of 3861213 is 3121683.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3861213 - 2¹ = 3861211 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 (3861211) 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, 643533 + ... + 643538.

It is an arithmetic number, because the mean of its divisors is an integer number (1287072).

Almost surely, 2^3861213 is an apocalyptic number.

It is an amenable number.

3861213 is a deficient number, since it is larger than the sum of its proper divisors (1287075).

3861213 is a wasteful number, since it uses less digits than its factorization.

3861213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287074.

The product of its digits is 864, while the sum is 24.

The square root of 3861213 is about 1964.9969465625. The cubic root of 3861213 is about 156.8825307623.

Adding to 3861213 its reverse (3121683), we get a palindrome (6982896).

The spelling of 3861213 in words is "three million, eight hundred sixty-one thousand, two hundred thirteen".