684834947 has 4 divisors (see below), whose sum is σ = 684951120. Its totient is φ = 684718776.

The previous prime is 684834937. The next prime is 684834967. The reversal of 684834947 is 749438486.

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

It is a cyclic number.

It is not a de Polignac number, because 684834947 - 2¹⁰ = 684833923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684834937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48743 + ... + 61200.

It is an arithmetic number, because the mean of its divisors is an integer number (171237780).

Almost surely, 2^684834947 is an apocalyptic number.

684834947 is a deficient number, since it is larger than the sum of its proper divisors (116173).

684834947 is a wasteful number, since it uses less digits than its factorization.

684834947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116172.

The product of its digits is 4644864, while the sum is 53.

The square root of 684834947 is about 26169.3512911574. The cubic root of 684834947 is about 881.4451748715.

The spelling of 684834947 in words is "six hundred eighty-four million, eight hundred thirty-four thousand, nine hundred forty-seven".