10640909 has 4 divisors (see below), whose sum is σ = 10888416. Its totient is φ = 10393404.

The previous prime is 10640899. The next prime is 10640911. The reversal of 10640909 is 90904601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90904601 = 521 ⋅174481.

It is a cyclic number.

It is not a de Polignac number, because 10640909 - 2¹⁶ = 10575373 is a prime.

It is a super-2 number, since 2×10640909² = 226457888692562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10640939) 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 in 3 ways as a sum of consecutive naturals, for example, 123689 + ... + 123774.

It is an arithmetic number, because the mean of its divisors is an integer number (2722104).

Almost surely, 2^10640909 is an apocalyptic number.

It is an amenable number.

10640909 is a deficient number, since it is larger than the sum of its proper divisors (247507).

10640909 is an equidigital number, since it uses as much as digits as its factorization.

10640909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247506.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 10640909 is about 3262.0406189991. The cubic root of 10640909 is about 219.9511530671.

The spelling of 10640909 in words is "ten million, six hundred forty thousand, nine hundred nine".