684411739 has 4 divisors (see below), whose sum is σ = 746631000. Its totient is φ = 622192480.

The previous prime is 684411703. The next prime is 684411743. The reversal of 684411739 is 937114486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684411739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684411695 and 684411704.

It is not an unprimeable number, because it can be changed into a prime (684411799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31109614 + ... + 31109635.

It is an arithmetic number, because the mean of its divisors is an integer number (186657750).

Almost surely, 2^684411739 is an apocalyptic number.

684411739 is a deficient number, since it is larger than the sum of its proper divisors (62219261).

684411739 is a wasteful number, since it uses less digits than its factorization.

684411739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62219260.

The product of its digits is 145152, while the sum is 43.

The square root of 684411739 is about 26161.2640940762. The cubic root of 684411739 is about 881.2635683306.

The spelling of 684411739 in words is "six hundred eighty-four million, four hundred eleven thousand, seven hundred thirty-nine".