1287489 has 16 divisors (see below), whose sum is σ = 2016128. Its totient is φ = 715392.

The previous prime is 1287487. The next prime is 1287491. The reversal of 1287489 is 9847821.

It is an interprime number because it is at equal distance from previous prime (1287487) and next prime (1287491).

It is not a de Polignac number, because 1287489 - 2¹ = 1287487 is a prime.

It is a super-3 number, since 3×1287489³ = 6402533159058333507, which contains 333 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1287489 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1287487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52 + ... + 1605.

It is an arithmetic number, because the mean of its divisors is an integer number (126008).

2^1287489 is an apocalyptic number.

It is an amenable number.

1287489 is a deficient number, since it is larger than the sum of its proper divisors (728639).

1287489 is a wasteful number, since it uses less digits than its factorization.

1287489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704.

The product of its digits is 32256, while the sum is 39.

The square root of 1287489 is about 1134.6757246015. The cubic root of 1287489 is about 108.7880458770.

The spelling of 1287489 in words is "one million, two hundred eighty-seven thousand, four hundred eighty-nine".