1272409 has 2 divisors, whose sum is σ = 1272410. Its totient is φ = 1272408.

The previous prime is 1272379. The next prime is 1272421. The reversal of 1272409 is 9042721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1272384 + 25 = 1128^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272409 - 2⁵ = 1272377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1272109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636204 + 636205.

It is an arithmetic number, because the mean of its divisors is an integer number (636205).

2^1272409 is an apocalyptic number.

It is an amenable number.

1272409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272409 is an equidigital number, since it uses as much as digits as its factorization.

1272409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1272409 is about 1128.0110815059. The cubic root of 1272409 is about 108.3616420431.

Subtracting from 1272409 its sum of digits (25), we obtain a square (1272384 = 1128²).

It can be divided in two parts, 1272 and 409, that added together give a square (1681 = 41²).

The spelling of 1272409 in words is "one million, two hundred seventy-two thousand, four hundred nine".