1289365 has 32 divisors (see below), whose sum is σ = 2052864. Its totient is φ = 752640.

The previous prime is 1289363. The next prime is 1289371. The reversal of 1289365 is 5639821.

It is not a de Polignac number, because 1289365 - 2¹ = 1289363 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1289365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289363) 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 31 ways as a sum of consecutive naturals, for example, 6447 + ... + 6643.

It is an arithmetic number, because the mean of its divisors is an integer number (64152).

2^1289365 is an apocalyptic number.

It is an amenable number.

1289365 is a deficient number, since it is larger than the sum of its proper divisors (763499).

1289365 is a wasteful number, since it uses less digits than its factorization.

1289365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237.

The product of its digits is 12960, while the sum is 34.

The square root of 1289365 is about 1135.5020915877. The cubic root of 1289365 is about 108.8408585818.

It can be divided in two parts, 128936 and 5, that multiplied together give a triangular number (644680 = T₁₁₃₅).

The spelling of 1289365 in words is "one million, two hundred eighty-nine thousand, three hundred sixty-five".