1225845 has 12 divisors (see below), whose sum is σ = 2124876. Its totient is φ = 653760.

The previous prime is 1225817. The next prime is 1225849. The reversal of 1225845 is 5485221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 956484 + 269361 = 978^2 + 519^2 .

It is not a de Polignac number, because 1225845 - 2⁸ = 1225589 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225849) 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 11 ways as a sum of consecutive naturals, for example, 13576 + ... + 13665.

It is an arithmetic number, because the mean of its divisors is an integer number (177073).

2^1225845 is an apocalyptic number.

1225845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1225845 is a deficient number, since it is larger than the sum of its proper divisors (899031).

1225845 is a wasteful number, since it uses less digits than its factorization.

1225845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27252 (or 27249 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 1225845 is about 1107.1788473413. The cubic root of 1225845 is about 107.0233448350.

The spelling of 1225845 in words is "one million, two hundred twenty-five thousand, eight hundred forty-five".