1287939272 has 16 divisors (see below), whose sum is σ = 2415522060. Its totient is φ = 643800064.

The previous prime is 1287939269. The next prime is 1287939287. The reversal of 1287939272 is 2729397821.

It can be written as a sum of positive squares in 2 ways, for example, as 1281210436 + 6728836 = 35794^2 + 2594^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1287939272.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14648 + ... + 52824.

Almost surely, 2^1287939272 is an apocalyptic number.

It is an amenable number.

1287939272 is a deficient number, since it is larger than the sum of its proper divisors (1127582788).

1287939272 is a wasteful number, since it uses less digits than its factorization.

1287939272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42400 (or 42396 counting only the distinct ones).

The product of its digits is 762048, while the sum is 50.

The square root of 1287939272 is about 35887.8708200974. The cubic root of 1287939272 is about 1088.0072650358.

The spelling of 1287939272 in words is "one billion, two hundred eighty-seven million, nine hundred thirty-nine thousand, two hundred seventy-two".