12942009 has 6 divisors (see below), whose sum is σ = 18694026. Its totient is φ = 8628000.

The previous prime is 12941993. The next prime is 12942023. The reversal of 12942009 is 90024921.

It can be written as a sum of positive squares in only one way, i.e., 12938409 + 3600 = 3597^2 + 60^2 .

It is not a de Polignac number, because 12942009 - 2⁴ = 12941993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12942079) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 718992 + ... + 719009.

It is an arithmetic number, because the mean of its divisors is an integer number (3115671).

Almost surely, 2^12942009 is an apocalyptic number.

It is an amenable number.

12942009 is a deficient number, since it is larger than the sum of its proper divisors (5752017).

12942009 is a wasteful number, since it uses less digits than its factorization.

12942009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438007 (or 1438004 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 12942009 is about 3597.5003822098. The cubic root of 12942009 is about 234.7833161859.

The spelling of 12942009 in words is "twelve million, nine hundred forty-two thousand, nine".