684834427 has 2 divisors, whose sum is σ = 684834428. Its totient is φ = 684834426.

The previous prime is 684834349. The next prime is 684834463. The reversal of 684834427 is 724438486.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684834427 is a prime.

It is not a weakly prime, because it can be changed into another prime (684832427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342417213 + 342417214.

It is an arithmetic number, because the mean of its divisors is an integer number (342417214).

Almost surely, 2^684834427 is an apocalyptic number.

684834427 is a deficient number, since it is larger than the sum of its proper divisors (1).

684834427 is an equidigital number, since it uses as much as digits as its factorization.

684834427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1032192, while the sum is 46.

The square root of 684834427 is about 26169.3413558691. The cubic root of 684834427 is about 881.4449517756. Note that the first 3 decimals are identical.

It can be divided in two parts, 68 and 4834427, that added together give a triangular number (4834495 = T₃₁₀₉).

The spelling of 684834427 in words is "six hundred eighty-four million, eight hundred thirty-four thousand, four hundred twenty-seven".