12569409 has 12 divisors (see below), whose sum is σ = 19224036. Its totient is φ = 7886592.

The previous prime is 12569387. The next prime is 12569413. The reversal of 12569409 is 90496521.

It can be written as a sum of positive squares in 2 ways, for example, as 6051600 + 6517809 = 2460^2 + 2553^2 .

It is not a de Polignac number, because 12569409 - 2⁵ = 12569377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12569489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40924 + ... + 41229.

It is an arithmetic number, because the mean of its divisors is an integer number (1602003).

Almost surely, 2^12569409 is an apocalyptic number.

It is an amenable number.

12569409 is a deficient number, since it is larger than the sum of its proper divisors (6654627).

12569409 is a wasteful number, since it uses less digits than its factorization.

12569409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82176 (or 82173 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 12569409 is about 3545.3362322917. The cubic root of 12569409 is about 232.5082064394.

The spelling of 12569409 in words is "twelve million, five hundred sixty-nine thousand, four hundred nine".