10639885 has 4 divisors (see below), whose sum is σ = 12767868. Its totient is φ = 8511904.

The previous prime is 10639879. The next prime is 10639891. The reversal of 10639885 is 58893601.

10639885 = 2306² + 2307².

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58893601 = 13 ⋅4530277.

It is an interprime number because it is at equal distance from previous prime (10639879) and next prime (10639891).

It can be written as a sum of positive squares in 2 ways, for example, as 5322249 + 5317636 = 2307^2 + 2306^2 .

It is a cyclic number.

It is not a de Polignac number, because 10639885 - 2¹⁹ = 10115597 is a prime.

It is a super-2 number, since 2×10639885² = 226414305626450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063984 + ... + 1063993.

It is an arithmetic number, because the mean of its divisors is an integer number (3191967).

Almost surely, 2^10639885 is an apocalyptic number.

10639885 is the 2307-th centered square number.

It is an amenable number.

10639885 is a deficient number, since it is larger than the sum of its proper divisors (2127983).

10639885 is an equidigital number, since it uses as much as digits as its factorization.

10639885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127982.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 10639885 is about 3261.8836582564. The cubic root of 10639885 is about 219.9440973664.

The spelling of 10639885 in words is "ten million, six hundred thirty-nine thousand, eight hundred eighty-five".