508394987 has 2 divisors, whose sum is σ = 508394988. Its totient is φ = 508394986.

The previous prime is 508394963. The next prime is 508395001. The reversal of 508394987 is 789493805.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 508394987 - 2¹² = 508390891 is a prime.

It is not a weakly prime, because it can be changed into another prime (508394287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254197493 + 254197494.

It is an arithmetic number, because the mean of its divisors is an integer number (254197494).

Almost surely, 2^508394987 is an apocalyptic number.

508394987 is a deficient number, since it is larger than the sum of its proper divisors (1).

508394987 is an equidigital number, since it uses as much as digits as its factorization.

508394987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 508394987 is about 22547.6159937143. The cubic root of 508394987 is about 798.1179649647.

The spelling of 508394987 in words is "five hundred eight million, three hundred ninety-four thousand, nine hundred eighty-seven".