1287915369 has 24 divisors (see below), whose sum is σ = 1862014752. Its totient is φ = 791481600.

The previous prime is 1287915347. The next prime is 1287915397. The reversal of 1287915369 is 9635197821.

It is not a de Polignac number, because 1287915369 - 2⁸ = 1287915113 is a prime.

It is a super-2 number, since 2×1287915369² = 3317451995412812322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1287915569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 531649 + ... + 534065.

It is an arithmetic number, because the mean of its divisors is an integer number (77583948).

Almost surely, 2^1287915369 is an apocalyptic number.

It is an amenable number.

1287915369 is a deficient number, since it is larger than the sum of its proper divisors (574099383).

1287915369 is a wasteful number, since it uses less digits than its factorization.

1287915369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497 (or 3484 counting only the distinct ones).

The product of its digits is 816480, while the sum is 51.

The square root of 1287915369 is about 35887.5377951734. The cubic root of 1287915369 is about 1088.0005341806. Note that the first 3 decimals are identical.

The spelling of 1287915369 in words is "one billion, two hundred eighty-seven million, nine hundred fifteen thousand, three hundred sixty-nine".