6678389 has 4 divisors (see below), whose sum is σ = 6858924. Its totient is φ = 6497856.

The previous prime is 6678383. The next prime is 6678401. The reversal of 6678389 is 9838766.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3771364 + 2907025 = 1942^2 + 1705^2 .

It is a cyclic number.

It is not a de Polignac number, because 6678389 - 2¹² = 6674293 is a prime.

It is a super-3 number, since 3×6678389³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6678383) 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, 90212 + ... + 90285.

It is an arithmetic number, because the mean of its divisors is an integer number (1714731).

Almost surely, 2^6678389 is an apocalyptic number.

It is an amenable number.

6678389 is a deficient number, since it is larger than the sum of its proper divisors (180535).

6678389 is a wasteful number, since it uses less digits than its factorization.

6678389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180534.

The product of its digits is 435456, while the sum is 47.

The square root of 6678389 is about 2584.2579205644. The cubic root of 6678389 is about 188.3174525640.

The spelling of 6678389 in words is "six million, six hundred seventy-eight thousand, three hundred eighty-nine".