684290407 has 2 divisors, whose sum is σ = 684290408. Its totient is φ = 684290406.

The previous prime is 684290381. The next prime is 684290449. The reversal of 684290407 is 704092486.

684290407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684290407 - 2¹¹ = 684288359 is a prime.

It is a super-2 number, since 2×684290407² = 936506722224451298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 684290407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684290207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342145203 + 342145204.

It is an arithmetic number, because the mean of its divisors is an integer number (342145204).

Almost surely, 2^684290407 is an apocalyptic number.

684290407 is a deficient number, since it is larger than the sum of its proper divisors (1).

684290407 is an equidigital number, since it uses as much as digits as its factorization.

684290407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 684290407 is about 26158.9450666498. The cubic root of 684290407 is about 881.2114886713.

The spelling of 684290407 in words is "six hundred eighty-four million, two hundred ninety thousand, four hundred seven".