9939449399 has 4 divisors (see below), whose sum is σ = 10843035720. Its totient is φ = 9035863080.

The previous prime is 9939449363. The next prime is 9939449407.

It is a happy number.

9939449399 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9939449399 is a prime.

It is a super-2 number, since 2×9939449399² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9939449339) 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, 451793144 + ... + 451793165.

It is an arithmetic number, because the mean of its divisors is an integer number (2710758930).

Almost surely, 2^9939449399 is an apocalyptic number.

9939449399 is a deficient number, since it is larger than the sum of its proper divisors (903586321).

9939449399 is a wasteful number, since it uses less digits than its factorization.

9939449399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903586320.

The product of its digits is 76527504, while the sum is 68.

The square root of 9939449399 is about 99696.7873053089. The cubic root of 9939449399 is about 2150.0774732494.

The spelling of 9939449399 in words is "nine billion, nine hundred thirty-nine million, four hundred forty-nine thousand, three hundred ninety-nine".