478146821 has 8 divisors (see below), whose sum is σ = 494321664. Its totient is φ = 462018960.

The previous prime is 478146817. The next prime is 478146829. The reversal of 478146821 is 128641874.

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 478146821 - 2² = 478146817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478146829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9596 + ... + 32378.

It is an arithmetic number, because the mean of its divisors is an integer number (61790208).

Almost surely, 2^478146821 is an apocalyptic number.

It is an amenable number.

478146821 is a deficient number, since it is larger than the sum of its proper divisors (16174843).

478146821 is a wasteful number, since it uses less digits than its factorization.

478146821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23491.

The product of its digits is 86016, while the sum is 41.

The square root of 478146821 is about 21866.5685693938. The cubic root of 478146821 is about 781.9645966795.

The spelling of 478146821 in words is "four hundred seventy-eight million, one hundred forty-six thousand, eight hundred twenty-one".