684394445 has 16 divisors (see below), whose sum is σ = 941173248. Its totient is φ = 468011520.

The previous prime is 684394429. The next prime is 684394531. The reversal of 684394445 is 544493486.

684394445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 684394445 - 2⁴ = 684394429 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 684394445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13796 + ... + 39485.

It is an arithmetic number, because the mean of its divisors is an integer number (58823328).

Almost surely, 2^684394445 is an apocalyptic number.

It is an amenable number.

684394445 is a deficient number, since it is larger than the sum of its proper divisors (256778803).

684394445 is a wasteful number, since it uses less digits than its factorization.

684394445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53660.

The product of its digits is 1658880, while the sum is 47.

The square root of 684394445 is about 26160.9335651463. The cubic root of 684394445 is about 881.2561455568.

The spelling of 684394445 in words is "six hundred eighty-four million, three hundred ninety-four thousand, four hundred forty-five".