684618389 has 8 divisors (see below), whose sum is σ = 842607360. Its totient is φ = 541676016.

The previous prime is 684618343. The next prime is 684618397. The reversal of 684618389 is 983816486.

684618389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 684618389 - 2⁸ = 684618133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684618389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684618329) 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, 3761549 + ... + 3761730.

It is an arithmetic number, because the mean of its divisors is an integer number (105325920).

Almost surely, 2^684618389 is an apocalyptic number.

It is an amenable number.

684618389 is a deficient number, since it is larger than the sum of its proper divisors (157988971).

684618389 is a wasteful number, since it uses less digits than its factorization.

684618389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7523299.

The product of its digits is 1990656, while the sum is 53.

The square root of 684618389 is about 26165.2133375595. The cubic root of 684618389 is about 881.3522550962.

The spelling of 684618389 in words is "six hundred eighty-four million, six hundred eighteen thousand, three hundred eighty-nine".