1225789 has 4 divisors (see below), whose sum is σ = 1238524. Its totient is φ = 1213056.

The previous prime is 1225787. The next prime is 1225817. The reversal of 1225789 is 9875221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9875221 = 73 ⋅135277.

It can be written as a sum of positive squares in 2 ways, for example, as 308025 + 917764 = 555^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225789 - 2¹ = 1225787 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6222 + ... + 6415.

It is an arithmetic number, because the mean of its divisors is an integer number (309631).

2^1225789 is an apocalyptic number.

It is an amenable number.

1225789 is a deficient number, since it is larger than the sum of its proper divisors (12735).

1225789 is an equidigital number, since it uses as much as digits as its factorization.

1225789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12734.

The product of its digits is 10080, while the sum is 34.

The square root of 1225789 is about 1107.1535575520. The cubic root of 1225789 is about 107.0217151024.

The spelling of 1225789 in words is "one million, two hundred twenty-five thousand, seven hundred eighty-nine".