1276409 has 2 divisors, whose sum is σ = 1276410. Its totient is φ = 1276408.

The previous prime is 1276397. The next prime is 1276433. The reversal of 1276409 is 9046721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1006009 + 270400 = 1003^2 + 520^2 .

It is an emirp because it is prime and its reverse (9046721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1276409 - 2¹⁶ = 1210873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1272409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638204 + 638205.

It is an arithmetic number, because the mean of its divisors is an integer number (638205).

2^1276409 is an apocalyptic number.

It is an amenable number.

1276409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276409 is an equidigital number, since it uses as much as digits as its factorization.

1276409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1276409 is about 1129.7827224737. The cubic root of 1276409 is about 108.4750733794.

The spelling of 1276409 in words is "one million, two hundred seventy-six thousand, four hundred nine".