1318040816 has 20 divisors (see below), whose sum is σ = 2613093912. Its totient is φ = 643694016.

The previous prime is 1318040813. The next prime is 1318040827. The reversal of 1318040816 is 6180408131.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318040813) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 957191 + ... + 958566.

Almost surely, 2^1318040816 is an apocalyptic number.

1318040816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1318040816 is a deficient number, since it is larger than the sum of its proper divisors (1295053096).

1318040816 is a wasteful number, since it uses less digits than its factorization.

1318040816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915808 (or 1915802 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1318040816 is about 36304.8318547270. The cubic root of 1318040816 is about 1096.4183273544.

Adding to 1318040816 its reverse (6180408131), we get a palindrome (7498448947).

The spelling of 1318040816 in words is "one billion, three hundred eighteen million, forty thousand, eight hundred sixteen".