1287444984 has 64 divisors (see below), whose sum is σ = 3681469440. Its totient is φ = 367536000.

The previous prime is 1287444979. The next prime is 1287445021. The reversal of 1287444984 is 4894447821.

It is a congruent 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, 268609 + ... + 273359.

It is an arithmetic number, because the mean of its divisors is an integer number (57522960).

Almost surely, 2^1287444984 is an apocalyptic number.

1287444984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1287444984 is an abundant number, since it is smaller than the sum of its proper divisors (2394024456).

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

1287444984 is a wasteful number, since it uses less digits than its factorization.

1287444984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6380 (or 6376 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 51.

The square root of 1287444984 is about 35880.9835985582. The cubic root of 1287444984 is about 1087.8680613329.

The spelling of 1287444984 in words is "one billion, two hundred eighty-seven million, four hundred forty-four thousand, nine hundred eighty-four".