478143818 has 4 divisors (see below), whose sum is σ = 717215730. Its totient is φ = 239071908.

The previous prime is 478143817. The next prime is 478143821. The reversal of 478143818 is 818341874.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 445505449 + 32638369 = 21107^2 + 5713^2 .

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (478143811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119535953 + ... + 119535956.

Almost surely, 2^478143818 is an apocalyptic number.

478143818 is a deficient number, since it is larger than the sum of its proper divisors (239071912).

478143818 is a wasteful number, since it uses less digits than its factorization.

478143818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239071911.

The product of its digits is 172032, while the sum is 44.

The square root of 478143818 is about 21866.4999028194. The cubic root of 478143818 is about 781.9629596338.

The spelling of 478143818 in words is "four hundred seventy-eight million, one hundred forty-three thousand, eight hundred eighteen".