1287939852 has 72 divisors (see below), whose sum is σ = 3553950400. Its totient is φ = 406712016.

The previous prime is 1287939841. The next prime is 1287939883. The reversal of 1287939852 is 2589397821.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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, 16402 + ... + 53337.

Almost surely, 2^1287939852 is an apocalyptic number.

1287939852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1287939852 is an abundant number, since it is smaller than the sum of its proper divisors (2266010548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1287939852 is a wasteful number, since it uses less digits than its factorization.

1287939852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69777 (or 69763 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 1287939852 is about 35887.8789008211. The cubic root of 1287939852 is about 1088.0074283572.

The spelling of 1287939852 in words is "one billion, two hundred eighty-seven million, nine hundred thirty-nine thousand, eight hundred fifty-two".