6858409 has 4 divisors (see below), whose sum is σ = 7079680. Its totient is φ = 6637140.

The previous prime is 6858407. The next prime is 6858427. The reversal of 6858409 is 9048586.

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 6858409 - 2¹ = 6858407 is a prime.

It is a super-2 number, since 2×6858409² = 94075548022562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6858403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110589 + ... + 110650.

It is an arithmetic number, because the mean of its divisors is an integer number (1769920).

Almost surely, 2^6858409 is an apocalyptic number.

It is an amenable number.

6858409 is a deficient number, since it is larger than the sum of its proper divisors (221271).

6858409 is a wasteful number, since it uses less digits than its factorization.

6858409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221270.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 6858409 is about 2618.8564298182. The cubic root of 6858409 is about 189.9945427795.

The spelling of 6858409 in words is "six million, eight hundred fifty-eight thousand, four hundred nine".