478249939 has 2 divisors, whose sum is σ = 478249940. Its totient is φ = 478249938.

The previous prime is 478249861. The next prime is 478249949. The reversal of 478249939 is 939942874.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 478249939 - 2⁹ = 478249427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 478249939.

It is not a weakly prime, because it can be changed into another prime (478249949) 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, 239124969 + 239124970.

It is an arithmetic number, because the mean of its divisors is an integer number (239124970).

Almost surely, 2^478249939 is an apocalyptic number.

478249939 is a deficient number, since it is larger than the sum of its proper divisors (1).

478249939 is an equidigital number, since it uses as much as digits as its factorization.

478249939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 55.

The square root of 478249939 is about 21868.9263339561. The cubic root of 478249939 is about 782.0208059343.

The spelling of 478249939 in words is "four hundred seventy-eight million, two hundred forty-nine thousand, nine hundred thirty-nine".