9949992138 has 24 divisors (see below), whose sum is σ = 22059674208. Its totient is φ = 3239532072.

The previous prime is 9949992137. The next prime is 9949992139. The reversal of 9949992138 is 8312999499.

9949992138 is a `hidden beast` number, since 9 + 9 + 499 + 9 + 2 + 138 = 666.

It is an interprime number because it is at equal distance from previous prime (9949992137) and next prime (9949992139).

It is a super-2 number, since 2×9949992138² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9949992137) 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 11 ways as a sum of consecutive naturals, for example, 6426870 + ... + 6428417.

It is an arithmetic number, because the mean of its divisors is an integer number (919153092).

Almost surely, 2^9949992138 is an apocalyptic number.

9949992138 is an abundant number, since it is smaller than the sum of its proper divisors (12109682070).

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

9949992138 is a wasteful number, since it uses less digits than its factorization.

9949992138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12855338 (or 12855335 counting only the distinct ones).

The product of its digits is 11337408, while the sum is 63.

The square root of 9949992138 is about 99749.6473076472. The cubic root of 9949992138 is about 2150.8373978328.

The spelling of 9949992138 in words is "nine billion, nine hundred forty-nine million, nine hundred ninety-two thousand, one hundred thirty-eight".