684697449 has 8 divisors (see below), whose sum is σ = 914837760. Its totient is φ = 455511056.

The previous prime is 684697439. The next prime is 684697451. The reversal of 684697449 is 944796486.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684697449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684697439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236802 + ... + 239675.

It is an arithmetic number, because the mean of its divisors is an integer number (114354720).

Almost surely, 2^684697449 is an apocalyptic number.

It is an amenable number.

684697449 is a deficient number, since it is larger than the sum of its proper divisors (230140311).

684697449 is a wasteful number, since it uses less digits than its factorization.

684697449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476959.

The product of its digits is 10450944, while the sum is 57.

The square root of 684697449 is about 26166.7240784933. The cubic root of 684697449 is about 881.3861800917.

The spelling of 684697449 in words is "six hundred eighty-four million, six hundred ninety-seven thousand, four hundred forty-nine".