865867213 has 4 divisors (see below), whose sum is σ = 870704640. Its totient is φ = 861029788.

The previous prime is 865867193. The next prime is 865867217. The reversal of 865867213 is 312768568.

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 865867213 - 2¹⁷ = 865736141 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 (865867217) 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, 2418445 + ... + 2418802.

It is an arithmetic number, because the mean of its divisors is an integer number (217676160).

Almost surely, 2^865867213 is an apocalyptic number.

It is an amenable number.

865867213 is a deficient number, since it is larger than the sum of its proper divisors (4837427).

865867213 is a wasteful number, since it uses less digits than its factorization.

865867213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4837426.

The product of its digits is 483840, while the sum is 46.

The square root of 865867213 is about 29425.6217096598. The cubic root of 865867213 is about 953.1262523004.

The spelling of 865867213 in words is "eight hundred sixty-five million, eight hundred sixty-seven thousand, two hundred thirteen".