1218645740 has 24 divisors (see below), whose sum is σ = 2756014800. Its totient is φ = 449961408.

The previous prime is 1218645737. The next prime is 1218645787. The reversal of 1218645740 is 475468121.

It is a junction number, because it is equal to n+sod(n) for n = 1218645694 and 1218645703.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2343290 + ... + 2343809.

It is an arithmetic number, because the mean of its divisors is an integer number (114833950).

Almost surely, 2^1218645740 is an apocalyptic number.

1218645740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218645740 is an abundant number, since it is smaller than the sum of its proper divisors (1537369060).

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

1218645740 is a wasteful number, since it uses less digits than its factorization.

1218645740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4687121 (or 4687119 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 1218645740 is about 34909.1068347502. The cubic root of 1218645740 is about 1068.1342102469.

The spelling of 1218645740 in words is "one billion, two hundred eighteen million, six hundred forty-five thousand, seven hundred forty".