678139 has 8 divisors (see below), whose sum is σ = 845568. Its totient is φ = 528360.

The previous prime is 678133. The next prime is 678157. The reversal of 678139 is 931876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 678139 - 2⁹ = 677627 is a prime.

It is a Duffinian number.

678139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (678133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4327 + ... + 4480.

It is an arithmetic number, because the mean of its divisors is an integer number (105696).

2⁶⁷⁸¹³⁹ is an apocalyptic number.

678139 is a deficient number, since it is larger than the sum of its proper divisors (167429).

678139 is a wasteful number, since it uses less digits than its factorization.

678139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8825.

The product of its digits is 9072, while the sum is 34.

The square root of 678139 is about 823.4919550305. The cubic root of 678139 is about 87.8562995616.

The spelling of 678139 in words is "six hundred seventy-eight thousand, one hundred thirty-nine".