1281409 has 4 divisors (see below), whose sum is σ = 1356804. Its totient is φ = 1206016.

The previous prime is 1281407. The next prime is 1281431. The reversal of 1281409 is 9041821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9041821 = 107 ⋅84503.

It can be written as a sum of positive squares in 2 ways, for example, as 1081600 + 199809 = 1040^2 + 447^2 .

It is a cyclic number.

It is not a de Polignac number, because 1281409 - 2¹ = 1281407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1281407) 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, 37672 + ... + 37705.

It is an arithmetic number, because the mean of its divisors is an integer number (339201).

2^1281409 is an apocalyptic number.

It is an amenable number.

1281409 is a deficient number, since it is larger than the sum of its proper divisors (75395).

1281409 is an equidigital number, since it uses as much as digits as its factorization.

1281409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75394.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1281409 is about 1131.9933745389. The cubic root of 1281409 is about 108.6165297880.

The spelling of 1281409 in words is "one million, two hundred eighty-one thousand, four hundred nine".