9638138 has 4 divisors (see below), whose sum is σ = 14457210. Its totient is φ = 4819068.

The previous prime is 9638137. The next prime is 9638143. The reversal of 9638138 is 8318369.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8318369 = 131 ⋅63499.

It can be written as a sum of positive squares in only one way, i.e., 5650129 + 3988009 = 2377^2 + 1997^2 .

It is not an unprimeable number, because it can be changed into a prime (9638137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2409533 + ... + 2409536.

Almost surely, 2^9638138 is an apocalyptic number.

9638138 is a deficient number, since it is larger than the sum of its proper divisors (4819072).

9638138 is a wasteful number, since it uses less digits than its factorization.

9638138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4819071.

The product of its digits is 31104, while the sum is 38.

The square root of 9638138 is about 3104.5350698615. The cubic root of 9638138 is about 212.8127841312.

The spelling of 9638138 in words is "nine million, six hundred thirty-eight thousand, one hundred thirty-eight".