684239389 has 4 divisors (see below), whose sum is σ = 684525600. Its totient is φ = 683953180.

The previous prime is 684239359. The next prime is 684239401. The reversal of 684239389 is 983932486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 684239389 - 2⁵ = 684239357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684239329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139489 + ... + 144310.

It is an arithmetic number, because the mean of its divisors is an integer number (171131400).

Almost surely, 2^684239389 is an apocalyptic number.

It is an amenable number.

684239389 is a deficient number, since it is larger than the sum of its proper divisors (286211).

684239389 is a wasteful number, since it uses less digits than its factorization.

684239389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286210.

The product of its digits is 2239488, while the sum is 52.

The square root of 684239389 is about 26157.9698944700. The cubic root of 684239389 is about 881.1895882401.

The spelling of 684239389 in words is "six hundred eighty-four million, two hundred thirty-nine thousand, three hundred eighty-nine".