1287844416 has 42 divisors (see below), whose sum is σ = 3691375142. Its totient is φ = 429281280.

The previous prime is 1287844387. The next prime is 1287844423. The reversal of 1287844416 is 6144487821.

1287844416 is a `hidden beast` number, since 128 + 7 + 84 + 441 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1259966016 + 27878400 = 35496^2 + 5280^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117345 + ... + 1118496.

Almost surely, 2^1287844416 is an apocalyptic number.

1287844416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1287844416 is an abundant number, since it is smaller than the sum of its proper divisors (2403530726).

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

1287844416 is a wasteful number, since it uses less digits than its factorization.

1287844416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235859 (or 2235846 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 1287844416 is about 35886.5492350546. The cubic root of 1287844416 is about 1087.9805540065.

The spelling of 1287844416 in words is "one billion, two hundred eighty-seven million, eight hundred forty-four thousand, four hundred sixteen".