684240430 has 16 divisors (see below), whose sum is σ = 1235598624. Its totient is φ = 272814880.

The previous prime is 684240397. The next prime is 684240439. The reversal of 684240430 is 34042486.

It is a junction number, because it is equal to n+sod(n) for n = 684240392 and 684240401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684240439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106897 + ... + 113116.

It is an arithmetic number, because the mean of its divisors is an integer number (77224914).

Almost surely, 2^684240430 is an apocalyptic number.

684240430 is a deficient number, since it is larger than the sum of its proper divisors (551358194).

684240430 is a wasteful number, since it uses less digits than its factorization.

684240430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220331.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 684240430 is about 26157.9897927956. The cubic root of 684240430 is about 881.1900351197.

The spelling of 684240430 in words is "six hundred eighty-four million, two hundred forty thousand, four hundred thirty".