1318036640 has 24 divisors (see below), whose sum is σ = 3113861940. Its totient is φ = 527214592.

The previous prime is 1318036627. The next prime is 1318036661. The reversal of 1318036640 is 466308131.

It can be written as a sum of positive squares in 2 ways, for example, as 1316528656 + 1507984 = 36284^2 + 1228^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1318036597 and 1318036606.

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, 4118705 + ... + 4119024.

Almost surely, 2^1318036640 is an apocalyptic number.

1318036640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1318036640 is an abundant number, since it is smaller than the sum of its proper divisors (1795825300).

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

1318036640 is an equidigital number, since it uses as much as digits as its factorization.

1318036640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8237744 (or 8237736 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 1318036640 is about 36304.7743416758. The cubic root of 1318036640 is about 1096.4171694116.

The spelling of 1318036640 in words is "one billion, three hundred eighteen million, thirty-six thousand, six hundred forty".