9172138 has 4 divisors (see below), whose sum is σ = 13758210. Its totient is φ = 4586068.

The previous prime is 9172133. The next prime is 9172153. The reversal of 9172138 is 8312719.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8312719 = 311 ⋅26729.

It can be written as a sum of positive squares in only one way, i.e., 9162729 + 9409 = 3027^2 + 97^2 .

It is not an unprimeable number, because it can be changed into a prime (9172133) 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, 2293033 + ... + 2293036.

Almost surely, 2^9172138 is an apocalyptic number.

9172138 is a deficient number, since it is larger than the sum of its proper divisors (4586072).

9172138 is a wasteful number, since it uses less digits than its factorization.

9172138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4586071.

The product of its digits is 3024, while the sum is 31.

The square root of 9172138 is about 3028.5537802720. The cubic root of 9172138 is about 209.3261697370.

The spelling of 9172138 in words is "nine million, one hundred seventy-two thousand, one hundred thirty-eight".