1312987144 has 96 divisors (see below), whose sum is σ = 2987712000. Its totient is φ = 538755840.

The previous prime is 1312987139. The next prime is 1312987187. The reversal of 1312987144 is 4417892131.

It is a junction number, because it is equal to n+sod(n) for n = 1312987097 and 1312987106.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1251132 + ... + 1252180.

It is an arithmetic number, because the mean of its divisors is an integer number (31122000).

Almost surely, 2^1312987144 is an apocalyptic number.

1312987144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312987144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1493856000).

1312987144 is an abundant number, since it is smaller than the sum of its proper divisors (1674724856).

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

1312987144 is a wasteful number, since it uses less digits than its factorization.

1312987144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203 (or 1192 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 1312987144 is about 36235.1644676825. The cubic root of 1312987144 is about 1095.0152257705.

It can be divided in two parts, 1312987 and 144, that added together give a palindrome (1313131).

The spelling of 1312987144 in words is "one billion, three hundred twelve million, nine hundred eighty-seven thousand, one hundred forty-four".