1318807440 has 80 divisors (see below), whose sum is σ = 4542566400. Its totient is φ = 351681408.

The previous prime is 1318807417. The next prime is 1318807489. The reversal of 1318807440 is 447088131.

1318807440 is a `hidden beast` number, since 131 + 8 + 80 + 7 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 1318807395 and 1318807404.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303120 + ... + 307439.

It is an arithmetic number, because the mean of its divisors is an integer number (56782080).

Almost surely, 2^1318807440 is an apocalyptic number.

1318807440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1318807440 is an abundant number, since it is smaller than the sum of its proper divisors (3223758960).

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

1318807440 is a wasteful number, since it uses less digits than its factorization.

1318807440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610581 (or 610569 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 1318807440 is about 36315.3884737586. The cubic root of 1318807440 is about 1096.6308593900.

The spelling of 1318807440 in words is "one billion, three hundred eighteen million, eight hundred seven thousand, four hundred forty".