9999940005 has 96 divisors (see below), whose sum is σ = 20229326208. Its totient is φ = 4515840000.

The previous prime is 9999939923. The next prime is 9999940019. The reversal of 9999940005 is 5000499999.

It is a happy number.

It is not a de Polignac number, because 9999940005 - 2⁹ = 9999939493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 810130 + ... + 822380.

It is an arithmetic number, because the mean of its divisors is an integer number (210722148).

Almost surely, 2^9999940005 is an apocalyptic number.

It is an amenable number.

9999940005 is an abundant number, since it is smaller than the sum of its proper divisors (10229386203).

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

9999940005 is a wasteful number, since it uses less digits than its factorization.

9999940005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12387 (or 12384 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 54.

The square root of 9999940005 is about 99999.7000245501. The cubic root of 9999940005 is about 2154.4303815130.

The spelling of 9999940005 in words is "nine billion, nine hundred ninety-nine million, nine hundred forty thousand, five".