9939997915 has 16 divisors (see below), whose sum is σ = 12727792800. Its totient is φ = 7430268672.

The previous prime is 9939997901. The next prime is 9939997931. The reversal of 9939997915 is 5197999399.

It is a cyclic number.

It is not a de Polignac number, because 9939997915 - 2¹⁹ = 9939473627 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 709720 + ... + 723589.

It is an arithmetic number, because the mean of its divisors is an integer number (795487050).

Almost surely, 2^9939997915 is an apocalyptic number.

9939997915 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

9939997915 is a deficient number, since it is larger than the sum of its proper divisors (2787794885).

9939997915 is a wasteful number, since it uses less digits than its factorization.

9939997915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433406.

The product of its digits is 55801305, while the sum is 70.

The square root of 9939997915 is about 99699.5381884991. The cubic root of 9939997915 is about 2150.1170237367.

The spelling of 9939997915 in words is "nine billion, nine hundred thirty-nine million, nine hundred ninety-seven thousand, nine hundred fifteen".