304039993 has 2 divisors, whose sum is σ = 304039994. Its totient is φ = 304039992.

The previous prime is 304039987. The next prime is 304040003. The reversal of 304039993 is 399930403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301091904 + 2948089 = 17352^2 + 1717^2 .

It is an emirp because it is prime and its reverse (399930403) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 304039993 - 2¹⁷ = 303908921 is a prime.

It is not a weakly prime, because it can be changed into another prime (304039493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152019996 + 152019997.

It is an arithmetic number, because the mean of its divisors is an integer number (152019997).

Almost surely, 2^304039993 is an apocalyptic number.

It is an amenable number.

304039993 is a deficient number, since it is larger than the sum of its proper divisors (1).

304039993 is an equidigital number, since it uses as much as digits as its factorization.

304039993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 40.

The square root of 304039993 is about 17436.7426143761. The cubic root of 304039993 is about 672.4245659183.

The spelling of 304039993 in words is "three hundred four million, thirty-nine thousand, nine hundred ninety-three".