478827821 has 2 divisors, whose sum is σ = 478827822. Its totient is φ = 478827820.

The previous prime is 478827809. The next prime is 478827827. The reversal of 478827821 is 128728874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275194921 + 203632900 = 16589^2 + 14270^2 .

It is a cyclic number.

It is not a de Polignac number, because 478827821 - 2¹⁰ = 478826797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478827827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239413910 + 239413911.

It is an arithmetic number, because the mean of its divisors is an integer number (239413911).

Almost surely, 2^478827821 is an apocalyptic number.

It is an amenable number.

478827821 is a deficient number, since it is larger than the sum of its proper divisors (1).

478827821 is an equidigital number, since it uses as much as digits as its factorization.

478827821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 401408, while the sum is 47.

The square root of 478827821 is about 21882.1347450380. The cubic root of 478827821 is about 782.3356579339.

The spelling of 478827821 in words is "four hundred seventy-eight million, eight hundred twenty-seven thousand, eight hundred twenty-one".