9940423917 has 8 divisors (see below), whose sum is σ = 13297072096. Its totient is φ = 6605362512.

The previous prime is 9940423853. The next prime is 9940423937. The reversal of 9940423917 is 7193240499.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9940423917 - 2⁶ = 9940423853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9940423937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5395618 + ... + 5397459.

It is an arithmetic number, because the mean of its divisors is an integer number (1662134012).

Almost surely, 2^9940423917 is an apocalyptic number.

It is an amenable number.

9940423917 is a deficient number, since it is larger than the sum of its proper divisors (3356648179).

9940423917 is a wasteful number, since it uses less digits than its factorization.

9940423917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10793387.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 9940423917 is about 99701.6745947630. The cubic root of 9940423917 is about 2150.1477394060.

It can be divided in two parts, 99404 and 23917, that added together give a palindrome (123321).

The spelling of 9940423917 in words is "nine billion, nine hundred forty million, four hundred twenty-three thousand, nine hundred seventeen".