1287887449 has 8 divisors (see below), whose sum is σ = 1340929800. Its totient is φ = 1235875200.

The previous prime is 1287887441. The next prime is 1287887473. The reversal of 1287887449 is 9447887821.

It can be written as a sum of positive squares in 4 ways, for example, as 34727449 + 1253160000 = 5893^2 + 35400^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1287887449 - 2³ = 1287887441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1287887393 and 1287887402.

It is not an unprimeable number, because it can be changed into a prime (1287887441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254974 + ... + 259975.

It is an arithmetic number, because the mean of its divisors is an integer number (167616225).

Almost surely, 2^1287887449 is an apocalyptic number.

It is an amenable number.

1287887449 is a deficient number, since it is larger than the sum of its proper divisors (53042351).

1287887449 is an equidigital number, since it uses as much as digits as its factorization.

1287887449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515051.

The product of its digits is 7225344, while the sum is 58.

The square root of 1287887449 is about 35887.1488000928. The cubic root of 1287887449 is about 1087.9926720712.

The spelling of 1287887449 in words is "one billion, two hundred eighty-seven million, eight hundred eighty-seven thousand, four hundred forty-nine".