478221385 has 8 divisors (see below), whose sum is σ = 584693640. Its totient is φ = 375358464.

The previous prime is 478221371. The next prime is 478221427. The reversal of 478221385 is 583122874.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4549689 + 473671696 = 2133^2 + 21764^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 478221385 - 2⁵ = 478221353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 902040 + ... + 902569.

It is an arithmetic number, because the mean of its divisors is an integer number (73086705).

Almost surely, 2^478221385 is an apocalyptic number.

It is an amenable number.

478221385 is a deficient number, since it is larger than the sum of its proper divisors (106472255).

478221385 is a wasteful number, since it uses less digits than its factorization.

478221385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804667.

The product of its digits is 107520, while the sum is 40.

The square root of 478221385 is about 21868.2734800898. The cubic root of 478221385 is about 782.0052420595.

The spelling of 478221385 in words is "four hundred seventy-eight million, two hundred twenty-one thousand, three hundred eighty-five".