1287969 has 8 divisors (see below), whose sum is σ = 1723392. Its totient is φ = 855600.

The previous prime is 1287967. The next prime is 1287973. The reversal of 1287969 is 9697821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1287969 - 2¹ = 1287967 is a prime.

It is a super-2 number, since 2×1287969² = 3317728289922, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287969.

It is not an unprimeable number, because it can be changed into a prime (1287961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544 + ... + 1694.

It is an arithmetic number, because the mean of its divisors is an integer number (215424).

2^1287969 is an apocalyptic number.

It is an amenable number.

1287969 is a deficient number, since it is larger than the sum of its proper divisors (435423).

1287969 is a wasteful number, since it uses less digits than its factorization.

1287969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527.

The product of its digits is 54432, while the sum is 42.

The square root of 1287969 is about 1134.8872190663. The cubic root of 1287969 is about 108.8015636039.

The spelling of 1287969 in words is "one million, two hundred eighty-seven thousand, nine hundred sixty-nine".