684208389 has 8 divisors (see below), whose sum is σ = 933493792. Its totient is φ = 445530960.

The previous prime is 684208361. The next prime is 684208423. The reversal of 684208389 is 983802486.

It is a happy number.

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

It is not a de Polignac number, because 684208389 - 2¹⁹ = 683684101 is a prime.

It is a super-2 number, since 2×684208389² = 936282239155950642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684208289) 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, 2651842 + ... + 2652099.

It is an arithmetic number, because the mean of its divisors is an integer number (116686724).

Almost surely, 2^684208389 is an apocalyptic number.

It is an amenable number.

684208389 is a deficient number, since it is larger than the sum of its proper divisors (249285403).

684208389 is a wasteful number, since it uses less digits than its factorization.

684208389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303987.

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 684208389 is about 26157.3773341289. The cubic root of 684208389 is about 881.1762803782.

The spelling of 684208389 in words is "six hundred eighty-four million, two hundred eight thousand, three hundred eighty-nine".