684450243 has 40 divisors (see below), whose sum is σ = 1139616720. Its totient is φ = 406840320.

The previous prime is 684450227. The next prime is 684450251. The reversal of 684450243 is 342054486.

684450243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 26162²-1.

It is not a de Polignac number, because 684450243 - 2⁴ = 684450227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 684450198 and 684450207.

It is not an unprimeable number, because it can be changed into a prime (684450253) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13083 + ... + 39243.

It is an arithmetic number, because the mean of its divisors is an integer number (28490418).

Almost surely, 2^684450243 is an apocalyptic number.

684450243 is a deficient number, since it is larger than the sum of its proper divisors (455166477).

684450243 is a wasteful number, since it uses less digits than its factorization.

684450243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26209 (or 26200 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The square root of 684450243 is about 26161.9999808883. Note that the first 4 decimals coincide. The cubic root of 684450243 is about 881.2800942190.

The spelling of 684450243 in words is "six hundred eighty-four million, four hundred fifty thousand, two hundred forty-three".