9910639 has 4 divisors (see below), whose sum is σ = 9931000. Its totient is φ = 9890280.

The previous prime is 9910627. The next prime is 9910657. The reversal of 9910639 is 9360199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9360199 = 241 ⋅38839.

It is a cyclic number.

It is not a de Polignac number, because 9910639 - 2¹³ = 9902447 is a prime.

It is a Duffinian number.

9910639 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 9910598 and 9910607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9916639) 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, 9432 + ... + 10429.

It is an arithmetic number, because the mean of its divisors is an integer number (2482750).

Almost surely, 2^9910639 is an apocalyptic number.

9910639 is a deficient number, since it is larger than the sum of its proper divisors (20361).

9910639 is a wasteful number, since it uses less digits than its factorization.

9910639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20360.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 9910639 is about 3148.1167386233. The cubic root of 9910639 is about 214.7998064400.

The spelling of 9910639 in words is "nine million, nine hundred ten thousand, six hundred thirty-nine".