680239439 has 4 divisors (see below), whose sum is σ = 742079400. Its totient is φ = 618399480.

The previous prime is 680239397. The next prime is 680239481. The reversal of 680239439 is 934932086.

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

It is an interprime number because it is at equal distance from previous prime (680239397) and next prime (680239481).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680239439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 680239439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680233439) 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, 30919964 + ... + 30919985.

It is an arithmetic number, because the mean of its divisors is an integer number (185519850).

Almost surely, 2^680239439 is an apocalyptic number.

680239439 is a deficient number, since it is larger than the sum of its proper divisors (61839961).

680239439 is a wasteful number, since it uses less digits than its factorization.

680239439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61839960.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 680239439 is about 26081.4002499866. The cubic root of 680239439 is about 879.4691353099.

The spelling of 680239439 in words is "six hundred eighty million, two hundred thirty-nine thousand, four hundred thirty-nine".