478221447 has 16 divisors (see below), whose sum is σ = 711773568. Its totient is φ = 283090080.

The previous prime is 478221439. The next prime is 478221461. The reversal of 478221447 is 744122874.

It is a happy number.

It is not a de Polignac number, because 478221447 - 2³ = 478221439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478221427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167088 + ... + 169925.

It is an arithmetic number, because the mean of its divisors is an integer number (44485848).

Almost surely, 2^478221447 is an apocalyptic number.

478221447 is a deficient number, since it is larger than the sum of its proper divisors (233552121).

478221447 is a wasteful number, since it uses less digits than its factorization.

478221447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337070.

The product of its digits is 100352, while the sum is 39.

The square root of 478221447 is about 21868.2748976685. The cubic root of 478221447 is about 782.0052758544.

The spelling of 478221447 in words is "four hundred seventy-eight million, two hundred twenty-one thousand, four hundred forty-seven".