9999365940 has 144 divisors (see below), whose sum is σ = 30833187840. Its totient is φ = 2622574080.

The previous prime is 9999365927. The next prime is 9999365941. The reversal of 9999365940 is 495639999.

9999365940 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 36 + 594 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999365941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7756816 + ... + 7758104.

It is an arithmetic number, because the mean of its divisors is an integer number (214119360).

Almost surely, 2^9999365940 is an apocalyptic number.

9999365940 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999365940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15416593920).

9999365940 is an abundant number, since it is smaller than the sum of its proper divisors (20833821900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9999365940 is a wasteful number, since it uses less digits than its factorization.

9999365940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982 (or 1977 counting only the distinct ones).

The product of its (nonzero) digits is 21257640, while the sum is 63.

The square root of 9999365940 is about 99996.8296497444. The cubic root of 9999365940 is about 2154.3891543741.

The spelling of 9999365940 in words is "nine billion, nine hundred ninety-nine million, three hundred sixty-five thousand, nine hundred forty".