9999939826990 has 64 divisors (see below), whose sum is σ = 18839707729920. Its totient is φ = 3817666120960.

The previous prime is 9999939826969. The next prime is 9999939826991. The reversal of 9999939826990 is 996289399999.

It is a happy number.

It is a super-2 number, since 2×9999939826990² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9999939826895 and 9999939826904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999939826991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43106931 + ... + 43338289.

It is an arithmetic number, because the mean of its divisors is an integer number (294370433280).

Almost surely, 2^{9999939826990} is an apocalyptic number.

9999939826990 is a deficient number, since it is larger than the sum of its proper divisors (8839767902930).

9999939826990 is a wasteful number, since it uses less digits than its factorization.

9999939826990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233697.

The product of its (nonzero) digits is 12397455648, while the sum is 91.

The spelling of 9999939826990 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred thirty-nine million, eight hundred twenty-six thousand, nine hundred ninety".