9905999379 has 16 divisors (see below), whose sum is σ = 13410463872. Its totient is φ = 6502845888.

The previous prime is 9905999371. The next prime is 9905999387. The reversal of 9905999379 is 9739995099.

It is an interprime number because it is at equal distance from previous prime (9905999371) and next prime (9905999387).

It is not a de Polignac number, because 9905999379 - 2³ = 9905999371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9905999371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 587247 + ... + 603879.

It is an arithmetic number, because the mean of its divisors is an integer number (838153992).

Almost surely, 2^9905999379 is an apocalyptic number.

9905999379 is a deficient number, since it is larger than the sum of its proper divisors (3504464493).

9905999379 is a wasteful number, since it uses less digits than its factorization.

9905999379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19666.

The product of its (nonzero) digits is 55801305, while the sum is 69.

The square root of 9905999379 is about 99528.8871584526. The cubic root of 9905999379 is about 2147.6628202074.

The spelling of 9905999379 in words is "nine billion, nine hundred five million, nine hundred ninety-nine thousand, three hundred seventy-nine".