1312515738 has 40 divisors (see below), whose sum is σ = 2943087840. Its totient is φ = 437195880.

The previous prime is 1312515697. The next prime is 1312515773. The reversal of 1312515738 is 8375152131.

It is a happy number.

1312515738 is a `hidden beast` number, since 1 + 31 + 2 + 51 + 573 + 8 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 409723 + ... + 412913.

It is an arithmetic number, because the mean of its divisors is an integer number (73577196).

Almost surely, 2^1312515738 is an apocalyptic number.

1312515738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1312515738 is an abundant number, since it is smaller than the sum of its proper divisors (1630572102).

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

1312515738 is a wasteful number, since it uses less digits than its factorization.

1312515738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5744 (or 5735 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 1312515738 is about 36228.6590698579. The cubic root of 1312515738 is about 1094.8841611368.

Adding to 1312515738 its reverse (8375152131), we get a palindrome (9687667869).

The spelling of 1312515738 in words is "one billion, three hundred twelve million, five hundred fifteen thousand, seven hundred thirty-eight".