684709389 has 96 divisors (see below), whose sum is σ = 1303102080. Its totient is φ = 351993600.

The previous prime is 684709387. The next prime is 684709429. The reversal of 684709389 is 983907486.

684709389 is a `hidden beast` number, since 6 + 8 + 470 + 93 + 89 = 666.

It is not a de Polignac number, because 684709389 - 2¹ = 684709387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684709387) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 704674 + ... + 705644.

It is an arithmetic number, because the mean of its divisors is an integer number (13573980).

Almost surely, 2^684709389 is an apocalyptic number.

It is an amenable number.

684709389 is a deficient number, since it is larger than the sum of its proper divisors (618392691).

684709389 is a wasteful number, since it uses less digits than its factorization.

684709389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 684709389 is about 26166.9522298643. The cubic root of 684709389 is about 881.3913033715.

The spelling of 684709389 in words is "six hundred eighty-four million, seven hundred nine thousand, three hundred eighty-nine".