1287494144 has 40 divisors (see below), whose sum is σ = 2581168128. Its totient is φ = 641571840.

The previous prime is 1287494107. The next prime is 1287494213. The reversal of 1287494144 is 4414947821.

It is a junction number, because it is equal to n+sod(n) for n = 1287494095 and 1287494104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153089 + ... + 161279.

Almost surely, 2^1287494144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287494144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1290584064).

1287494144 is an abundant number, since it is smaller than the sum of its proper divisors (1293673984).

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

1287494144 is an frugal number, since it uses more digits than its factorization.

1287494144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8516 (or 8500 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 1287494144 is about 35881.6686345549. The cubic root of 1287494144 is about 1087.8819075978.

The spelling of 1287494144 in words is "one billion, two hundred eighty-seven million, four hundred ninety-four thousand, one hundred forty-four".