840393707 has 2 divisors, whose sum is σ = 840393708. Its totient is φ = 840393706.

The previous prime is 840393661. The next prime is 840393709. The reversal of 840393707 is 707393048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840393707 - 2¹⁴ = 840377323 is a prime.

Together with 840393709, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840393709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420196853 + 420196854.

It is an arithmetic number, because the mean of its divisors is an integer number (420196854).

Almost surely, 2^840393707 is an apocalyptic number.

840393707 is a deficient number, since it is larger than the sum of its proper divisors (1).

840393707 is an equidigital number, since it uses as much as digits as its factorization.

840393707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 840393707 is about 28989.5447877334. The cubic root of 840393707 is about 943.6861848755.

The spelling of 840393707 in words is "eight hundred forty million, three hundred ninety-three thousand, seven hundred seven".