478166138 has 4 divisors (see below), whose sum is σ = 717249210. Its totient is φ = 239083068.

The previous prime is 478166131. The next prime is 478166147. The reversal of 478166138 is 831661874.

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., 319229689 + 158936449 = 17867^2 + 12607^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (478166131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119541533 + ... + 119541536.

Almost surely, 2^478166138 is an apocalyptic number.

478166138 is a deficient number, since it is larger than the sum of its proper divisors (239083072).

478166138 is a wasteful number, since it uses less digits than its factorization.

478166138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239083071.

The product of its digits is 193536, while the sum is 44.

The square root of 478166138 is about 21867.0102666094. The cubic root of 478166138 is about 781.9751269226.

The spelling of 478166138 in words is "four hundred seventy-eight million, one hundred sixty-six thousand, one hundred thirty-eight".