1318886388 has 42 divisors (see below), whose sum is σ = 3460501394. Its totient is φ = 439627824.

The previous prime is 1318886363. The next prime is 1318886407. The reversal of 1318886388 is 8836888131.

It is a happy number.

1318886388 is a `hidden beast` number, since 1 + 3 + 188 + 86 + 388 = 666.

It can be written as a sum of positive squares in only one way, i.e., 987719184 + 331167204 = 31428^2 + 18198^2 .

It is a super-2 number, since 2×1318886388² = 3478922608903373088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 223231 + ... + 229062.

Almost surely, 2^1318886388 is an apocalyptic number.

1318886388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1318886388 is an abundant number, since it is smaller than the sum of its proper divisors (2141615006).

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

1318886388 is an equidigital number, since it uses as much as digits as its factorization.

1318886388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452315 (or 452298 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 54.

The square root of 1318886388 is about 36316.4754347114. The cubic root of 1318886388 is about 1096.6527415549.

The spelling of 1318886388 in words is "one billion, three hundred eighteen million, eight hundred eighty-six thousand, three hundred eighty-eight".