9900005749 has 4 divisors (see below), whose sum is σ = 9904208364. Its totient is φ = 9895803136.

The previous prime is 9900005747. The next prime is 9900005779. The reversal of 9900005749 is 9475000099.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2790480625 + 7109525124 = 52825^2 + 84318^2 .

It is a cyclic number.

It is not a de Polignac number, because 9900005749 - 2¹ = 9900005747 is a prime.

It is a super-2 number, since 2×9900005749² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9900005747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097772 + ... + 2102485.

It is an arithmetic number, because the mean of its divisors is an integer number (2476052091).

Almost surely, 2^9900005749 is an apocalyptic number.

It is an amenable number.

9900005749 is a deficient number, since it is larger than the sum of its proper divisors (4202615).

9900005749 is a wasteful number, since it uses less digits than its factorization.

9900005749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202614.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 9900005749 is about 99498.7726004698. The cubic root of 9900005749 is about 2147.2295846559.

The spelling of 9900005749 in words is "nine billion, nine hundred million, five thousand, seven hundred forty-nine".