684427 has 2 divisors, whose sum is σ = 684428. Its totient is φ = 684426.

The previous prime is 684419. The next prime is 684433. The reversal of 684427 is 724486.

684427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684427 - 2³ = 684419 is a prime.

It is not a weakly prime, because it can be changed into another prime (684407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342213 + 342214.

It is an arithmetic number, because the mean of its divisors is an integer number (342214).

2⁶⁸⁴⁴²⁷ is an apocalyptic number.

684427 is a deficient number, since it is larger than the sum of its proper divisors (1).

684427 is an equidigital number, since it uses as much as digits as its factorization.

684427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

The square root of 684427 is about 827.3010334818. The cubic root of 684427 is about 88.1270118415.

It can be divided in two parts, 684 and 427, that added together give a palindrome (1111).

The spelling of 684427 in words is "six hundred eighty-four thousand, four hundred twenty-seven".