12990389 has 4 divisors (see below), whose sum is σ = 12999756. Its totient is φ = 12981024.

The previous prime is 12990371. The next prime is 12990403. The reversal of 12990389 is 98309921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6589489 + 6400900 = 2567^2 + 2530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12990389 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 (12990689) 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, 2144 + ... + 5529.

It is an arithmetic number, because the mean of its divisors is an integer number (3249939).

Almost surely, 2^12990389 is an apocalyptic number.

It is an amenable number.

12990389 is a deficient number, since it is larger than the sum of its proper divisors (9367).

12990389 is an equidigital number, since it uses as much as digits as its factorization.

12990389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9366.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 12990389 is about 3604.2182231380. The cubic root of 12990389 is about 235.0755091590.

The spelling of 12990389 in words is "twelve million, nine hundred ninety thousand, three hundred eighty-nine".