1289825 has 6 divisors (see below), whose sum is σ = 1599414. Its totient is φ = 1031840.

The previous prime is 1289803. The next prime is 1289831. The reversal of 1289825 is 5289821.

It can be written as a sum of positive squares in 3 ways, for example, as 421201 + 868624 = 649^2 + 932^2 .

It is not a de Polignac number, because 1289825 - 2²⁰ = 241249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 25772 + ... + 25821.

It is an arithmetic number, because the mean of its divisors is an integer number (266569).

2^1289825 is an apocalyptic number.

It is an amenable number.

1289825 is a deficient number, since it is larger than the sum of its proper divisors (309589).

1289825 is an equidigital number, since it uses as much as digits as its factorization.

1289825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51603 (or 51598 counting only the distinct ones).

The product of its digits is 11520, while the sum is 35.

The square root of 1289825 is about 1135.7046270928. The cubic root of 1289825 is about 108.8538005706.

The spelling of 1289825 in words is "one million, two hundred eighty-nine thousand, eight hundred twenty-five".