478207621 has 2 divisors, whose sum is σ = 478207622. Its totient is φ = 478207620.

The previous prime is 478207589. The next prime is 478207627. The reversal of 478207621 is 126702874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376903396 + 101304225 = 19414^2 + 10065^2 .

It is a cyclic number.

It is not a de Polignac number, because 478207621 - 2⁵ = 478207589 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 (478207627) 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, 239103810 + 239103811.

It is an arithmetic number, because the mean of its divisors is an integer number (239103811).

Almost surely, 2^478207621 is an apocalyptic number.

It is an amenable number.

478207621 is a deficient number, since it is larger than the sum of its proper divisors (1).

478207621 is an equidigital number, since it uses as much as digits as its factorization.

478207621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 478207621 is about 21867.9587753407. The cubic root of 478207621 is about 781.9977395207.

The spelling of 478207621 in words is "four hundred seventy-eight million, two hundred seven thousand, six hundred twenty-one".