9993989 has 2 divisors, whose sum is σ = 9993990. Its totient is φ = 9993988.

The previous prime is 9993967. The next prime is 9994001. The reversal of 9993989 is 9893999.

It is a happy number.

9993989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9972964 + 21025 = 3158^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 9993989 - 2¹⁶ = 9928453 is a prime.

It is a super-2 number, since 2×9993989² = 199759632264242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9993089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4996994 + 4996995.

It is an arithmetic number, because the mean of its divisors is an integer number (4996995).

Almost surely, 2^9993989 is an apocalyptic number.

It is an amenable number.

9993989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9993989 is an equidigital number, since it uses as much as digits as its factorization.

9993989 is an evil number, because the sum of its binary digits is even.

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

The square root of 9993989 is about 3161.3270947499. The cubic root of 9993989 is about 215.4002926612.

The spelling of 9993989 in words is "nine million, nine hundred ninety-three thousand, nine hundred eighty-nine".