12902909 has 4 divisors (see below), whose sum is σ = 12968604. Its totient is φ = 12837216.

The previous prime is 12902891. The next prime is 12902951. The reversal of 12902909 is 90920921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10272025 + 2630884 = 3205^2 + 1622^2 .

It is a cyclic number.

It is not a de Polignac number, because 12902909 - 2¹⁶ = 12837373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12902959) 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, 32552 + ... + 32945.

It is an arithmetic number, because the mean of its divisors is an integer number (3242151).

Almost surely, 2^12902909 is an apocalyptic number.

It is an amenable number.

12902909 is a deficient number, since it is larger than the sum of its proper divisors (65695).

12902909 is an equidigital number, since it uses as much as digits as its factorization.

12902909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65694.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 12902909 is about 3592.0619426730. The cubic root of 12902909 is about 234.5466376296.

The spelling of 12902909 in words is "twelve million, nine hundred two thousand, nine hundred nine".