1318859640 has 96 divisors (see below), whose sum is σ = 4898630880. Its totient is φ = 301453056.

The previous prime is 1318859623. The next prime is 1318859653. The reversal of 1318859640 is 469588131.

1318859640 is a `hidden beast` number, since 1 + 3 + 18 + 8 + 596 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 259159 + ... + 264198.

It is an arithmetic number, because the mean of its divisors is an integer number (51027405).

Almost surely, 2^1318859640 is an apocalyptic number.

1318859640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1318859640 is an abundant number, since it is smaller than the sum of its proper divisors (3579771240).

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

1318859640 is a wasteful number, since it uses less digits than its factorization.

1318859640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523381 (or 523374 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 1318859640 is about 36316.1071702351. The cubic root of 1318859640 is about 1096.6453278595.

The spelling of 1318859640 in words is "one billion, three hundred eighteen million, eight hundred fifty-nine thousand, six hundred forty".