478217849 has 2 divisors, whose sum is σ = 478217850. Its totient is φ = 478217848.

The previous prime is 478217827. The next prime is 478217867. The reversal of 478217849 is 948712874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 470890000 + 7327849 = 21700^2 + 2707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478217849 is a prime.

It is a super-2 number, since 2×478217849² = 457384622204373602, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 478217797 and 478217806.

It is not a weakly prime, because it can be changed into another prime (478217819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239108924 + 239108925.

It is an arithmetic number, because the mean of its divisors is an integer number (239108925).

Almost surely, 2^478217849 is an apocalyptic number.

It is an amenable number.

478217849 is a deficient number, since it is larger than the sum of its proper divisors (1).

478217849 is an equidigital number, since it uses as much as digits as its factorization.

478217849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 50.

The square root of 478217849 is about 21868.1926322227. The cubic root of 478217849 is about 782.0033146555.

The spelling of 478217849 in words is "four hundred seventy-eight million, two hundred seventeen thousand, eight hundred forty-nine".