1218194907840 has 224 divisors, whose sum is σ = 4445712216000. Its totient is φ = 313650118656.

The previous prime is 1218194907829. The next prime is 1218194907841. The reversal of 1218194907840 is 487094918121.

1218194907840 is a `hidden beast` number, since 1 + 2 + 1 + 81 + 9 + 490 + 78 + 4 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1218194907841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2180385 + ... + 2681504.

Almost surely, 2^{1218194907840} is an apocalyptic number.

1218194907840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218194907840 is an abundant number, since it is smaller than the sum of its proper divisors (3227517308160).

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

1218194907840 is a wasteful number, since it uses less digits than its factorization.

1218194907840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4861944 (or 4861928 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The spelling of 1218194907840 in words is "one trillion, two hundred eighteen billion, one hundred ninety-four million, nine hundred seven thousand, eight hundred forty".