9942864385 has 4 divisors (see below), whose sum is σ = 11931437268. Its totient is φ = 7954291504.

The previous prime is 9942864383. The next prime is 9942864389. The reversal of 9942864385 is 5834682499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5834682499 = 29347 ⋅198817.

It can be written as a sum of positive squares in 2 ways, for example, as 7308198144 + 2634666241 = 85488^2 + 51329^2 .

It is a cyclic number.

It is not a de Polignac number, because 9942864385 - 2¹ = 9942864383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9942864383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994286434 + ... + 994286443.

It is an arithmetic number, because the mean of its divisors is an integer number (2982859317).

Almost surely, 2^9942864385 is an apocalyptic number.

It is an amenable number.

9942864385 is a deficient number, since it is larger than the sum of its proper divisors (1988572883).

9942864385 is a wasteful number, since it uses less digits than its factorization.

9942864385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988572882.

The product of its digits is 14929920, while the sum is 58.

The square root of 9942864385 is about 99713.9126952704. The cubic root of 9942864385 is about 2150.3236855370.

The spelling of 9942864385 in words is "nine billion, nine hundred forty-two million, eight hundred sixty-four thousand, three hundred eighty-five".