9999389 has 4 divisors (see below), whose sum is σ = 10015356. Its totient is φ = 9983424.

The previous prime is 9999347. The next prime is 9999397. The reversal of 9999389 is 9839999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9839999 = 13 ⋅756923.

It can be written as a sum of positive squares in 2 ways, for example, as 648025 + 9351364 = 805^2 + 3058^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999389 - 2¹⁶ = 9933853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999289) 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, 7004 + ... + 8309.

It is an arithmetic number, because the mean of its divisors is an integer number (2503839).

Almost surely, 2^9999389 is an apocalyptic number.

It is an amenable number.

9999389 is a deficient number, since it is larger than the sum of its proper divisors (15967).

9999389 is a wasteful number, since it uses less digits than its factorization.

9999389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15966.

The product of its digits is 1417176, while the sum is 56.

The square root of 9999389 is about 3162.1810511101. The cubic root of 9999389 is about 215.4390810485.

The spelling of 9999389 in words is "nine million, nine hundred ninety-nine thousand, three hundred eighty-nine".