684442043 has 2 divisors, whose sum is σ = 684442044. Its totient is φ = 684442042.

The previous prime is 684442007. The next prime is 684442061. The reversal of 684442043 is 340244486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684442043 - 2¹² = 684437947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 684441994 and 684442012.

It is not a weakly prime, because it can be changed into another prime (684445043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342221021 + 342221022.

It is an arithmetic number, because the mean of its divisors is an integer number (342221022).

Almost surely, 2^684442043 is an apocalyptic number.

684442043 is a deficient number, since it is larger than the sum of its proper divisors (1).

684442043 is an equidigital number, since it uses as much as digits as its factorization.

684442043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 35.

The square root of 684442043 is about 26161.8432645714. The cubic root of 684442043 is about 881.2765748370.

The spelling of 684442043 in words is "six hundred eighty-four million, four hundred forty-two thousand, forty-three".