10909809 has 15 divisors (see below), whose sum is σ = 16341897. Its totient is φ = 7253388.

The previous prime is 10909807. The next prime is 10909817. The reversal of 10909809 is 90890901.

The square root of 10909809 is 3303.

It is a perfect power (a square), and thus also a powerful number.

10909809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10909809 - 2¹ = 10909807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10909807) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 29544 + ... + 29910.

Almost surely, 2^10909809 is an apocalyptic number.

10909809 is the 3303-rd square number.

10909809 is the 1652-nd centered octagonal number.

It is an amenable number.

10909809 is a deficient number, since it is larger than the sum of its proper divisors (5432088).

10909809 is an frugal number, since it uses more digits than its factorization.

10909809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The cubic root of 10909809 is about 221.7885129822.

Multiplying 10909809 by its sum of digits (36), we get a square (392753124 = 19818²).

The spelling of 10909809 in words is "ten million, nine hundred nine thousand, eight hundred nine".