9990389399 has 4 divisors (see below), whose sum is σ = 9993158136. Its totient is φ = 9987620664.

The previous prime is 9990389393. The next prime is 9990389407. The reversal of 9990389399 is 9939830999.

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-9990389399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990389393) 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, 1378949 + ... + 1386174.

It is an arithmetic number, because the mean of its divisors is an integer number (2498289534).

Almost surely, 2^9990389399 is an apocalyptic number.

9990389399 is a deficient number, since it is larger than the sum of its proper divisors (2768737).

9990389399 is a wasteful number, since it uses less digits than its factorization.

9990389399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768736.

The product of its (nonzero) digits is 38263752, while the sum is 68.

The square root of 9990389399 is about 99951.9354439923. The cubic root of 9990389399 is about 2153.7442884059.

The spelling of 9990389399 in words is "nine billion, nine hundred ninety million, three hundred eighty-nine thousand, three hundred ninety-nine".