6861399 has 4 divisors (see below), whose sum is σ = 9148536. Its totient is φ = 4574264.

The previous prime is 6861397. The next prime is 6861401. The reversal of 6861399 is 9931686.

6861399 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6861397) and next prime (6861401).

It is a cyclic number.

It is not a de Polignac number, because 6861399 - 2¹ = 6861397 is a prime.

It is an Ulam number.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 6861399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6861397) 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, 1143564 + ... + 1143569.

It is an arithmetic number, because the mean of its divisors is an integer number (2287134).

Almost surely, 2^6861399 is an apocalyptic number.

6861399 is a deficient number, since it is larger than the sum of its proper divisors (2287137).

6861399 is a wasteful number, since it uses less digits than its factorization.

6861399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287136.

The product of its digits is 69984, while the sum is 42.

The square root of 6861399 is about 2619.4272274679. The cubic root of 6861399 is about 190.0221488492.

It can be divided in two parts, 6861 and 399, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 6861399 in words is "six million, eight hundred sixty-one thousand, three hundred ninety-nine".