478289421 has 16 divisors (see below), whose sum is σ = 731435520. Its totient is φ = 308573280.

The previous prime is 478289419. The next prime is 478289479. The reversal of 478289421 is 124982874.

It is not a de Polignac number, because 478289421 - 2¹ = 478289419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478289411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284880 + ... + 286553.

It is an arithmetic number, because the mean of its divisors is an integer number (45714720).

Almost surely, 2^478289421 is an apocalyptic number.

It is an amenable number.

478289421 is a deficient number, since it is larger than the sum of its proper divisors (253146099).

478289421 is a wasteful number, since it uses less digits than its factorization.

478289421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571473 (or 571467 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 478289421 is about 21869.8290116773. The cubic root of 478289421 is about 782.0423252929.

The spelling of 478289421 in words is "four hundred seventy-eight million, two hundred eighty-nine thousand, four hundred twenty-one".