304143989 has 2 divisors, whose sum is σ = 304143990. Its totient is φ = 304143988.

The previous prime is 304143971. The next prime is 304144063. The reversal of 304143989 is 989341403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303351889 + 792100 = 17417^2 + 890^2 .

It is an emirp because it is prime and its reverse (989341403) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-304143989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304143919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152071994 + 152071995.

It is an arithmetic number, because the mean of its divisors is an integer number (152071995).

Almost surely, 2^304143989 is an apocalyptic number.

It is an amenable number.

304143989 is a deficient number, since it is larger than the sum of its proper divisors (1).

304143989 is an equidigital number, since it uses as much as digits as its factorization.

304143989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 304143989 is about 17439.7244530984. The cubic root of 304143989 is about 672.5012241378.

The spelling of 304143989 in words is "three hundred four million, one hundred forty-three thousand, nine hundred eighty-nine".