840078067 has 2 divisors, whose sum is σ = 840078068. Its totient is φ = 840078066.

The previous prime is 840078017. The next prime is 840078089. The reversal of 840078067 is 760870048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840078067 - 2⁷ = 840077939 is a prime.

It is not a weakly prime, because it can be changed into another prime (840078017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420039033 + 420039034.

It is an arithmetic number, because the mean of its divisors is an integer number (420039034).

Almost surely, 2^840078067 is an apocalyptic number.

840078067 is a deficient number, since it is larger than the sum of its proper divisors (1).

840078067 is an equidigital number, since it uses as much as digits as its factorization.

840078067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 840078067 is about 28984.1002447894. The cubic root of 840078067 is about 943.5680250163.

The spelling of 840078067 in words is "eight hundred forty million, seventy-eight thousand, sixty-seven".