1287938798 has 8 divisors (see below), whose sum is σ = 1933331760. Its totient is φ = 643494880.

The previous prime is 1287938783. The next prime is 1287938837. The reversal of 1287938798 is 8978397821.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1287938798.

It is a congruent number.

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, 233858 + ... + 239301.

It is an arithmetic number, because the mean of its divisors is an integer number (241666470).

Almost surely, 2^1287938798 is an apocalyptic number.

1287938798 is a deficient number, since it is larger than the sum of its proper divisors (645392962).

1287938798 is a wasteful number, since it uses less digits than its factorization.

1287938798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474522.

The product of its digits is 12192768, while the sum is 62.

The square root of 1287938798 is about 35887.8642161943. The cubic root of 1287938798 is about 1088.0071315628.

The spelling of 1287938798 in words is "one billion, two hundred eighty-seven million, nine hundred thirty-eight thousand, seven hundred ninety-eight".