9978902039 has 2 divisors, whose sum is σ = 9978902040. Its totient is φ = 9978902038.

The previous prime is 9978902033. The next prime is 9978902071. The reversal of 9978902039 is 9302098799.

9978902039 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9978902039 - 2²⁰ = 9977853463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9978902033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989451019 + 4989451020.

It is an arithmetic number, because the mean of its divisors is an integer number (4989451020).

Almost surely, 2^9978902039 is an apocalyptic number.

9978902039 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978902039 is an equidigital number, since it uses as much as digits as its factorization.

9978902039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The square root of 9978902039 is about 99894.4544957326. The cubic root of 9978902039 is about 2152.9184839339.

The spelling of 9978902039 in words is "nine billion, nine hundred seventy-eight million, nine hundred two thousand, thirty-nine".