478212321 has 8 divisors (see below), whose sum is σ = 643466560. Its totient is φ = 315883152.

The previous prime is 478212313. The next prime is 478212373. The reversal of 478212321 is 123212874.

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

It is not a de Polignac number, because 478212321 - 2³ = 478212313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (478212391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730885 + ... + 731538.

It is an arithmetic number, because the mean of its divisors is an integer number (80433320).

Almost surely, 2^478212321 is an apocalyptic number.

It is an amenable number.

478212321 is a deficient number, since it is larger than the sum of its proper divisors (165254239).

478212321 is a wasteful number, since it uses less digits than its factorization.

478212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462535.

The product of its digits is 5376, while the sum is 30.

The square root of 478212321 is about 21868.0662382388. The cubic root of 478212321 is about 782.0003014326. Note that the first 3 decimals are identical.

The spelling of 478212321 in words is "four hundred seventy-eight million, two hundred twelve thousand, three hundred twenty-one".