6861439 has 4 divisors (see below), whose sum is σ = 7389256. Its totient is φ = 6333624.

The previous prime is 6861431. The next prime is 6861461. The reversal of 6861439 is 9341686.

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

It is a cyclic number.

It is not a de Polignac number, because 6861439 - 2³ = 6861431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6861398 and 6861407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6861431) 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, 263889 + ... + 263914.

It is an arithmetic number, because the mean of its divisors is an integer number (1847314).

Almost surely, 2^6861439 is an apocalyptic number.

6861439 is a deficient number, since it is larger than the sum of its proper divisors (527817).

6861439 is a wasteful number, since it uses less digits than its factorization.

6861439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527816.

The product of its digits is 31104, while the sum is 37.

The square root of 6861439 is about 2619.4348627137. The cubic root of 6861439 is about 190.0225181068.

The spelling of 6861439 in words is "six million, eight hundred sixty-one thousand, four hundred thirty-nine".