478487381 has 2 divisors, whose sum is σ = 478487382. Its totient is φ = 478487380.

The previous prime is 478487371. The next prime is 478487417. The reversal of 478487381 is 183784874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 269944900 + 208542481 = 16430^2 + 14441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478487381 is a prime.

It is a super-2 number, since 2×478487381² = 457900347552478322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478487371) 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, 239243690 + 239243691.

It is an arithmetic number, because the mean of its divisors is an integer number (239243691).

Almost surely, 2^478487381 is an apocalyptic number.

It is an amenable number.

478487381 is a deficient number, since it is larger than the sum of its proper divisors (1).

478487381 is an equidigital number, since it uses as much as digits as its factorization.

478487381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1204224, while the sum is 50.

The square root of 478487381 is about 21874.3544133307. The cubic root of 478487381 is about 782.1502040083.

The spelling of 478487381 in words is "four hundred seventy-eight million, four hundred eighty-seven thousand, three hundred eighty-one".