1218464312440 has 64 divisors (see below), whose sum is σ = 2903716252800. Its totient is φ = 458573088768.

The previous prime is 1218464312413. The next prime is 1218464312453. The reversal of 1218464312440 is 442134648121.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1218464312393 and 1218464312402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1918257 + ... + 2473183.

It is an arithmetic number, because the mean of its divisors is an integer number (45370566450).

Almost surely, 2^{1218464312440} is an apocalyptic number.

1218464312440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218464312440 is an abundant number, since it is smaller than the sum of its proper divisors (1685251940360).

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

1218464312440 is a wasteful number, since it uses less digits than its factorization.

1218464312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558184 (or 558180 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 1218464312440 in words is "one trillion, two hundred eighteen billion, four hundred sixty-four million, three hundred twelve thousand, four hundred forty".