638169314 has 4 divisors (see below), whose sum is σ = 957253974. Its totient is φ = 319084656.

The previous prime is 638169313. The next prime is 638169349. The reversal of 638169314 is 413961836.

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., 636300625 + 1868689 = 25225^2 + 1367^2 .

It is not an unprimeable number, because it can be changed into a prime (638169313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159542327 + ... + 159542330.

Almost surely, 2^638169314 is an apocalyptic number.

638169314 is a deficient number, since it is larger than the sum of its proper divisors (319084660).

638169314 is a wasteful number, since it uses less digits than its factorization.

638169314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319084659.

The product of its digits is 93312, while the sum is 41.

The square root of 638169314 is about 25262.0132610210. The cubic root of 638169314 is about 860.9514051720.

The spelling of 638169314 in words is "six hundred thirty-eight million, one hundred sixty-nine thousand, three hundred fourteen".