1255409 has 4 divisors (see below), whose sum is σ = 1310016. Its totient is φ = 1200804.

The previous prime is 1255393. The next prime is 1255421. The reversal of 1255409 is 9045521.

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: 9045521 = 31 ⋅291791.

It is a cyclic number.

It is not a de Polignac number, because 1255409 - 2⁴ = 1255393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255109) 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, 27269 + ... + 27314.

It is an arithmetic number, because the mean of its divisors is an integer number (327504).

2^1255409 is an apocalyptic number.

It is an amenable number.

1255409 is a deficient number, since it is larger than the sum of its proper divisors (54607).

1255409 is an equidigital number, since it uses as much as digits as its factorization.

1255409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54606.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1255409 is about 1120.4503558837. The cubic root of 1255409 is about 107.8768887517.

The spelling of 1255409 in words is "one million, two hundred fifty-five thousand, four hundred nine".