1290409 has 4 divisors (see below), whose sum is σ = 1298304. Its totient is φ = 1282516.

The previous prime is 1290379. The next prime is 1290427. The reversal of 1290409 is 9040921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9040921 = 197 ⋅45893.

It is a cyclic number.

It is not a de Polignac number, because 1290409 - 2¹¹ = 1288361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290439) 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, 3697 + ... + 4030.

It is an arithmetic number, because the mean of its divisors is an integer number (324576).

2^1290409 is an apocalyptic number.

It is an amenable number.

1290409 is a deficient number, since it is larger than the sum of its proper divisors (7895).

1290409 is an equidigital number, since it uses as much as digits as its factorization.

1290409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7894.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1290409 is about 1135.9617071011. The cubic root of 1290409 is about 108.8702268371.

The spelling of 1290409 in words is "one million, two hundred ninety thousand, four hundred nine".