638474 has 4 divisors (see below), whose sum is σ = 957714. Its totient is φ = 319236.

The previous prime is 638467. The next prime is 638489. The reversal of 638474 is 474836.

It is a happy number.

638474 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 442225 + 196249 = 665^2 + 443^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 638474.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159617 + ... + 159620.

2⁶³⁸⁴⁷⁴ is an apocalyptic number.

638474 is a deficient number, since it is larger than the sum of its proper divisors (319240).

638474 is a wasteful number, since it uses less digits than its factorization.

638474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319239.

The product of its digits is 16128, while the sum is 32.

The square root of 638474 is about 799.0456807968. The cubic root of 638474 is about 86.1088400218.

The spelling of 638474 in words is "six hundred thirty-eight thousand, four hundred seventy-four".