305398987 has 2 divisors, whose sum is σ = 305398988. Its totient is φ = 305398986.

The previous prime is 305398981. The next prime is 305399023. The reversal of 305398987 is 789893503.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 305398987 - 2¹⁵ = 305366219 is a prime.

It is not a weakly prime, because it can be changed into another prime (305398981) 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 as a sum of consecutive naturals, namely, 152699493 + 152699494.

It is an arithmetic number, because the mean of its divisors is an integer number (152699494).

Almost surely, 2^305398987 is an apocalyptic number.

305398987 is a deficient number, since it is larger than the sum of its proper divisors (1).

305398987 is an equidigital number, since it uses as much as digits as its factorization.

305398987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 305398987 is about 17475.6684278456. The cubic root of 305398987 is about 673.4249417615.

The spelling of 305398987 in words is "three hundred five million, three hundred ninety-eight thousand, nine hundred eighty-seven".