9939997902 has 16 divisors (see below), whose sum is σ = 20073006720. Its totient is φ = 3281164152.

The previous prime is 9939997901. The next prime is 9939997931. The reversal of 9939997902 is 2097999399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9939997901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8041452 + ... + 8042687.

It is an arithmetic number, because the mean of its divisors is an integer number (1254562920).

Almost surely, 2^9939997902 is an apocalyptic number.

9939997902 is an abundant number, since it is smaller than the sum of its proper divisors (10133008818).

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

9939997902 is a wasteful number, since it uses less digits than its factorization.

9939997902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16084247.

The product of its (nonzero) digits is 22320522, while the sum is 66.

The square root of 9939997902 is about 99699.5381233033. The cubic root of 9939997902 is about 2150.1170227993.

The spelling of 9939997902 in words is "nine billion, nine hundred thirty-nine million, nine hundred ninety-seven thousand, nine hundred two".