1218374920 has 32 divisors (see below), whose sum is σ = 3132964800. Its totient is φ = 417728448.

The previous prime is 1218374869. The next prime is 1218374939. The reversal of 1218374920 is 294738121.

It is a self number, because there is not a number n which added to its sum of digits gives 1218374920.

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, 2175390 + ... + 2175949.

It is an arithmetic number, because the mean of its divisors is an integer number (97905150).

Almost surely, 2^1218374920 is an apocalyptic number.

1218374920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218374920 is an abundant number, since it is smaller than the sum of its proper divisors (1914589880).

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

1218374920 is a wasteful number, since it uses less digits than its factorization.

1218374920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4351357 (or 4351353 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1218374920 is about 34905.2276887002. The cubic root of 1218374920 is about 1068.0550804587.

The spelling of 1218374920 in words is "one billion, two hundred eighteen million, three hundred seventy-four thousand, nine hundred twenty".