478138 has 4 divisors (see below), whose sum is σ = 717210. Its totient is φ = 239068.

The previous prime is 478129. The next prime is 478139. The reversal of 478138 is 831874.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831874 = 2 ⋅415937.

It can be written as a sum of positive squares in only one way, i.e., 299209 + 178929 = 547^2 + 423^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (478139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119533 + ... + 119536.

2⁴⁷⁸¹³⁸ is an apocalyptic number.

478138 is a deficient number, since it is larger than the sum of its proper divisors (239072).

478138 is a wasteful number, since it uses less digits than its factorization.

478138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239071.

The product of its digits is 5376, while the sum is 31.

The square root of 478138 is about 691.4752345529. The cubic root of 478138 is about 78.1959788009.

It can be divided in two parts, 478 and 138, that added together give a palindrome (616).

The spelling of 478138 in words is "four hundred seventy-eight thousand, one hundred thirty-eight".