1225439 has 4 divisors (see below), whose sum is σ = 1228080. Its totient is φ = 1222800.

The previous prime is 1225409. The next prime is 1225459. The reversal of 1225439 is 9345221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9345221 = 29 ⋅322249.

It is a cyclic number.

It is not a de Polignac number, because 1225439 - 2⁸ = 1225183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419 + ... + 1620.

It is an arithmetic number, because the mean of its divisors is an integer number (307020).

2^1225439 is an apocalyptic number.

1225439 is a deficient number, since it is larger than the sum of its proper divisors (2641).

1225439 is an equidigital number, since it uses as much as digits as its factorization.

1225439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640.

The product of its digits is 2160, while the sum is 26.

The square root of 1225439 is about 1106.9954832790. The cubic root of 1225439 is about 107.0115281491.

The spelling of 1225439 in words is "one million, two hundred twenty-five thousand, four hundred thirty-nine".