680439 has 4 divisors (see below), whose sum is σ = 907256. Its totient is φ = 453624.

The previous prime is 680431. The next prime is 680441. The reversal of 680439 is 934086.

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

It is not a de Polignac number, because 680439 - 2³ = 680431 is a prime.

It is a super-3 number, since 3×680439³ = 945124122106333557, which contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680431) 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, 113404 + ... + 113409.

It is an arithmetic number, because the mean of its divisors is an integer number (226814).

2⁶⁸⁰⁴³⁹ is an apocalyptic number.

680439 is a deficient number, since it is larger than the sum of its proper divisors (226817).

680439 is a wasteful number, since it uses less digits than its factorization.

680439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226816.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 680439 is about 824.8872650247. The cubic root of 680439 is about 87.9555129824.

It can be divided in two parts, 6804 and 39, that multiplied together give a triangular number (265356 = T₇₂₈).

The spelling of 680439 in words is "six hundred eighty thousand, four hundred thirty-nine".