478677139 has 2 divisors, whose sum is σ = 478677140. Its totient is φ = 478677138.

The previous prime is 478677137. The next prime is 478677167. The reversal of 478677139 is 931776874.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 478677139 - 2¹ = 478677137 is a prime.

Together with 478677137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (478677137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239338569 + 239338570.

It is an arithmetic number, because the mean of its divisors is an integer number (239338570).

Almost surely, 2^478677139 is an apocalyptic number.

478677139 is a deficient number, since it is larger than the sum of its proper divisors (1).

478677139 is an equidigital number, since it uses as much as digits as its factorization.

478677139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 52.

The square root of 478677139 is about 21878.6914371038. The cubic root of 478677139 is about 782.2535850995.

The spelling of 478677139 in words is "four hundred seventy-eight million, six hundred seventy-seven thousand, one hundred thirty-nine".