1287238988 has 48 divisors (see below), whose sum is σ = 2606419200. Its totient is φ = 544864320.

The previous prime is 1287238969. The next prime is 1287239021. The reversal of 1287238988 is 8898327821.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1498103 + ... + 1498961.

It is an arithmetic number, because the mean of its divisors is an integer number (54300400).

Almost surely, 2^1287238988 is an apocalyptic number.

It is an amenable number.

1287238988 is an abundant number, since it is smaller than the sum of its proper divisors (1319180212).

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

1287238988 is a wasteful number, since it uses less digits than its factorization.

1287238988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470 (or 1468 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 56.

The square root of 1287238988 is about 35878.1129381131. The cubic root of 1287238988 is about 1087.8100372554.

The spelling of 1287238988 in words is "one billion, two hundred eighty-seven million, two hundred thirty-eight thousand, nine hundred eighty-eight".