1289345 has 4 divisors (see below), whose sum is σ = 1547220. Its totient is φ = 1031472.

The previous prime is 1289341. The next prime is 1289363. The reversal of 1289345 is 5439821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 919681 = 608^2 + 959^2 .

It is a cyclic number.

It is not a de Polignac number, because 1289345 - 2² = 1289341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1289341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128930 + ... + 128939.

It is an arithmetic number, because the mean of its divisors is an integer number (386805).

2^1289345 is an apocalyptic number.

It is an amenable number.

1289345 is a deficient number, since it is larger than the sum of its proper divisors (257875).

1289345 is an equidigital number, since it uses as much as digits as its factorization.

1289345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257874.

The product of its digits is 8640, while the sum is 32.

The square root of 1289345 is about 1135.4932848767. The cubic root of 1289345 is about 108.8402958168.

The spelling of 1289345 in words is "one million, two hundred eighty-nine thousand, three hundred forty-five".