1318861720 has 32 divisors (see below), whose sum is σ = 3237207120. Its totient is φ = 479585920.

The previous prime is 1318861711. The next prime is 1318861807. The reversal of 1318861720 is 271688131.

It is a self number, because there is not a number n which added to its sum of digits gives 1318861720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1498267 + ... + 1499146.

Almost surely, 2^1318861720 is an apocalyptic number.

1318861720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1318861720 is an abundant number, since it is smaller than the sum of its proper divisors (1918345400).

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

1318861720 is a wasteful number, since it uses less digits than its factorization.

1318861720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997435 (or 2997431 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1318861720 is about 36316.1358076544. The cubic root of 1318861720 is about 1096.6459043729.

The spelling of 1318861720 in words is "one billion, three hundred eighteen million, eight hundred sixty-one thousand, seven hundred twenty".