7871213 has 6 divisors (see below), whose sum is σ = 9156366. Its totient is φ = 6746712.

The previous prime is 7871207. The next prime is 7871219. The reversal of 7871213 is 3121787.

It is an interprime number because it is at equal distance from previous prime (7871207) and next prime (7871219).

It can be written as a sum of positive squares in only one way, i.e., 5368489 + 2502724 = 2317^2 + 1582^2 .

It is not a de Polignac number, because 7871213 - 2⁴ = 7871197 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 (7871219) 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 5 ways as a sum of consecutive naturals, for example, 80270 + ... + 80367.

It is an arithmetic number, because the mean of its divisors is an integer number (1526061).

Almost surely, 2^7871213 is an apocalyptic number.

It is an amenable number.

7871213 is a deficient number, since it is larger than the sum of its proper divisors (1285153).

7871213 is a wasteful number, since it uses less digits than its factorization.

7871213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160651 (or 160644 counting only the distinct ones).

The product of its digits is 2352, while the sum is 29.

The square root of 7871213 is about 2805.5682133928. The cubic root of 7871213 is about 198.9209638747.

The spelling of 7871213 in words is "seven million, eight hundred seventy-one thousand, two hundred thirteen".