304781 has 2 divisors, whose sum is σ = 304782. Its totient is φ = 304780.

The previous prime is 304771. The next prime is 304789. The reversal of 304781 is 187403.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 292681 + 12100 = 541^2 + 110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-304781 is a prime.

It is a super-2 number, since 2×304781² = 185782915922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 304781.

It is not a weakly prime, because it can be changed into another prime (304789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152390 + 152391.

It is an arithmetic number, because the mean of its divisors is an integer number (152391).

2³⁰⁴⁷⁸¹ is an apocalyptic number.

It is an amenable number.

304781 is a deficient number, since it is larger than the sum of its proper divisors (1).

304781 is an equidigital number, since it uses as much as digits as its factorization.

304781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 304781 is about 552.0697419711. The cubic root of 304781 is about 67.2970400976.

The spelling of 304781 in words is "three hundred four thousand, seven hundred eighty-one".