9912756399 has 72 divisors (see below), whose sum is σ = 17476104240. Its totient is φ = 4953166848.

The previous prime is 9912756397. The next prime is 9912756401. The reversal of 9912756399 is 9936572199.

It is an interprime number because it is at equal distance from previous prime (9912756397) and next prime (9912756401).

It is not a de Polignac number, because 9912756399 - 2¹ = 9912756397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9912756397) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 682687 + ... + 697055.

It is an arithmetic number, because the mean of its divisors is an integer number (242723670).

Almost surely, 2^9912756399 is an apocalyptic number.

9912756399 is a deficient number, since it is larger than the sum of its proper divisors (7563347841).

9912756399 is a wasteful number, since it uses less digits than its factorization.

9912756399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14437 (or 14411 counting only the distinct ones).

The product of its digits is 8266860, while the sum is 60.

The square root of 9912756399 is about 99562.8263911788. The cubic root of 9912756399 is about 2148.1510261170.

The spelling of 9912756399 in words is "nine billion, nine hundred twelve million, seven hundred fifty-six thousand, three hundred ninety-nine".