1272009 has 4 divisors (see below), whose sum is σ = 1696016. Its totient is φ = 848004.

The previous prime is 1272001. The next prime is 1272043. The reversal of 1272009 is 9002721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1272009 - 2³ = 1272001 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272001) 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, 211999 + ... + 212004.

It is an arithmetic number, because the mean of its divisors is an integer number (424004).

2^1272009 is an apocalyptic number.

It is an amenable number.

1272009 is a deficient number, since it is larger than the sum of its proper divisors (424007).

1272009 is an equidigital number, since it uses as much as digits as its factorization.

1272009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424006.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 1272009 is about 1127.8337643465. The cubic root of 1272009 is about 108.3502858415.

The spelling of 1272009 in words is "one million, two hundred seventy-two thousand, nine".