9400778459 has 2 divisors, whose sum is σ = 9400778460. Its totient is φ = 9400778458.

The previous prime is 9400778423. The next prime is 9400778531. The reversal of 9400778459 is 9548770049.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9400778459 - 2³² = 5105811163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9400778459.

It is not a weakly prime, because it can be changed into another prime (9400778059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4700389229 + 4700389230.

It is an arithmetic number, because the mean of its divisors is an integer number (4700389230).

Almost surely, 2^9400778459 is an apocalyptic number.

9400778459 is a deficient number, since it is larger than the sum of its proper divisors (1).

9400778459 is an equidigital number, since it uses as much as digits as its factorization.

9400778459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The square root of 9400778459 is about 96957.6116609728. The cubic root of 9400778459 is about 2110.5125518231.

The spelling of 9400778459 in words is "nine billion, four hundred million, seven hundred seventy-eight thousand, four hundred fifty-nine".