304989 has 4 divisors (see below), whose sum is σ = 406656. Its totient is φ = 203324.

The previous prime is 304981. The next prime is 305017. The reversal of 304989 is 989403.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989403 = 3 ⋅329801.

It is a cyclic number.

It is not a de Polignac number, because 304989 - 2³ = 304981 is a prime.

It is a D-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 (304981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50829 + ... + 50834.

It is an arithmetic number, because the mean of its divisors is an integer number (101664).

2³⁰⁴⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

304989 is a deficient number, since it is larger than the sum of its proper divisors (101667).

304989 is a wasteful number, since it uses less digits than its factorization.

304989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101666.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 304989 is about 552.2580918375. The cubic root of 304989 is about 67.3123457337.

The spelling of 304989 in words is "three hundred four thousand, nine hundred eighty-nine".