684313639 has 8 divisors (see below), whose sum is σ = 688596480. Its totient is φ = 680044056.

The previous prime is 684313627. The next prime is 684313681. The reversal of 684313639 is 936313486.

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

It is a cyclic number.

It is not a de Polignac number, because 684313639 - 2¹⁷ = 684182567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684313595 and 684313604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684314639) 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, 112494 + ... + 118420.

It is an arithmetic number, because the mean of its divisors is an integer number (86074560).

Almost surely, 2^684313639 is an apocalyptic number.

684313639 is a deficient number, since it is larger than the sum of its proper divisors (4282841).

684313639 is a wasteful number, since it uses less digits than its factorization.

684313639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6629.

The product of its digits is 279936, while the sum is 43.

The square root of 684313639 is about 26159.3891174851. The cubic root of 684313639 is about 881.2214610814.

The spelling of 684313639 in words is "six hundred eighty-four million, three hundred thirteen thousand, six hundred thirty-nine".