1318693780 has 12 divisors (see below), whose sum is σ = 2769256980. Its totient is φ = 527477504.

The previous prime is 1318693763. The next prime is 1318693793. The reversal of 1318693780 is 873968131.

It can be written as a sum of positive squares in 2 ways, for example, as 1052742916 + 265950864 = 32446^2 + 16308^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1318693780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32967325 + ... + 32967364.

It is an arithmetic number, because the mean of its divisors is an integer number (230771415).

Almost surely, 2^1318693780 is an apocalyptic number.

1318693780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1318693780 is an abundant number, since it is smaller than the sum of its proper divisors (1450563200).

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

1318693780 is a wasteful number, since it uses less digits than its factorization.

1318693780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65934698 (or 65934696 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 1318693780 is about 36313.8235387022. The cubic root of 1318693780 is about 1096.5993545014.

The spelling of 1318693780 in words is "one billion, three hundred eighteen million, six hundred ninety-three thousand, seven hundred eighty".