1318440816 has 120 divisors (see below), whose sum is σ = 4600312704. Its totient is φ = 342449280.

The previous prime is 1318440803. The next prime is 1318440817. The reversal of 1318440816 is 6180448131.

It is a happy number.

1318440816 is a `hidden beast` number, since 131 + 8 + 440 + 81 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318440817) 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 23 ways as a sum of consecutive naturals, for example, 48366 + ... + 70541.

Almost surely, 2^1318440816 is an apocalyptic number.

1318440816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1318440816 is an abundant number, since it is smaller than the sum of its proper divisors (3281871888).

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

1318440816 is a wasteful number, since it uses less digits than its factorization.

1318440816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118939 (or 118930 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 1318440816 is about 36310.3403454168. The cubic root of 1318440816 is about 1096.5292300841.

Adding to 1318440816 its reverse (6180448131), we get a palindrome (7498888947).

The spelling of 1318440816 in words is "one billion, three hundred eighteen million, four hundred forty thousand, eight hundred sixteen".