9140639 has 4 divisors (see below), whose sum is σ = 9353256. Its totient is φ = 8928024.

The previous prime is 9140633. The next prime is 9140641. The reversal of 9140639 is 9360419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9360419 = 31 ⋅301949.

It is a cyclic number.

It is not a de Polignac number, because 9140639 - 2⁴ = 9140623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9140633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106244 + ... + 106329.

It is an arithmetic number, because the mean of its divisors is an integer number (2338314).

Almost surely, 2^9140639 is an apocalyptic number.

9140639 is a deficient number, since it is larger than the sum of its proper divisors (212617).

9140639 is a wasteful number, since it uses less digits than its factorization.

9140639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212616.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 9140639 is about 3023.3489709261. The cubic root of 9140639 is about 209.0862719313.

It can be divided in two parts, 9140 and 639, that added together give a palindrome (9779).

The spelling of 9140639 in words is "nine million, one hundred forty thousand, six hundred thirty-nine".