6872813 has 4 divisors (see below), whose sum is σ = 7234560. Its totient is φ = 6511068.

The previous prime is 6872807. The next prime is 6872821. The reversal of 6872813 is 3182786.

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 6872813 - 2¹⁴ = 6856429 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 (6872893) 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, 180845 + ... + 180882.

It is an arithmetic number, because the mean of its divisors is an integer number (1808640).

Almost surely, 2^6872813 is an apocalyptic number.

It is an amenable number.

6872813 is a deficient number, since it is larger than the sum of its proper divisors (361747).

6872813 is a wasteful number, since it uses less digits than its factorization.

6872813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361746.

The product of its digits is 16128, while the sum is 35.

The square root of 6872813 is about 2621.6050427172. The cubic root of 6872813 is about 190.1274583372.

Subtracting from 6872813 its sum of digits (35), we obtain a triangular number (6872778 = T₃₇₀₇).

The spelling of 6872813 in words is "six million, eight hundred seventy-two thousand, eight hundred thirteen".