1287369 has 12 divisors (see below), whose sum is σ = 1869556. Its totient is φ = 853632.

The previous prime is 1287361. The next prime is 1287371. The reversal of 1287369 is 9637821.

It can be written as a sum of positive squares in 2 ways, for example, as 455625 + 831744 = 675^2 + 912^2 .

It is not a de Polignac number, because 1287369 - 2³ = 1287361 is a prime.

It is a super-2 number, since 2×1287369² = 3314637884322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2589 + ... + 3045.

2^1287369 is an apocalyptic number.

It is an amenable number.

1287369 is a deficient number, since it is larger than the sum of its proper divisors (582187).

1287369 is a wasteful number, since it uses less digits than its factorization.

1287369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776 (or 773 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 1287369 is about 1134.6228448255. The cubic root of 1287369 is about 108.7846659203.

The spelling of 1287369 in words is "one million, two hundred eighty-seven thousand, three hundred sixty-nine".