10409209 has 4 divisors (see below), whose sum is σ = 10415860. Its totient is φ = 10402560.

The previous prime is 10409197. The next prime is 10409213. The reversal of 10409209 is 90290401.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90290401 = 389 ⋅232109.

It can be written as a sum of positive squares in 2 ways, for example, as 1836025 + 8573184 = 1355^2 + 2928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10409209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10409249) 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, 457 + ... + 4585.

It is an arithmetic number, because the mean of its divisors is an integer number (2603965).

Almost surely, 2^10409209 is an apocalyptic number.

It is an amenable number.

10409209 is a deficient number, since it is larger than the sum of its proper divisors (6651).

10409209 is an equidigital number, since it uses as much as digits as its factorization.

10409209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6650.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 10409209 is about 3226.3305782266. The cubic root of 10409209 is about 218.3429847659.

The spelling of 10409209 in words is "ten million, four hundred nine thousand, two hundred nine".