1288489 has 4 divisors (see below), whose sum is σ = 1300420. Its totient is φ = 1276560.

The previous prime is 1288487. The next prime is 1288513. The reversal of 1288489 is 9848821.

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 514089 + 774400 = 717^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288489 - 2¹ = 1288487 is a prime.

It is a Duffinian number.

1288489 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1288487) 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, 5802 + ... + 6019.

It is an arithmetic number, because the mean of its divisors is an integer number (325105).

2^1288489 is an apocalyptic number.

It is an amenable number.

1288489 is a deficient number, since it is larger than the sum of its proper divisors (11931).

1288489 is a wasteful number, since it uses less digits than its factorization.

1288489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11930.

The product of its digits is 36864, while the sum is 40.

The square root of 1288489 is about 1135.1162936017. The cubic root of 1288489 is about 108.8162040186.

The spelling of 1288489 in words is "one million, two hundred eighty-eight thousand, four hundred eighty-nine".