1218899100 has 72 divisors (see below), whose sum is σ = 3530590000. Its totient is φ = 324679680.

The previous prime is 1218899089. The next prime is 1218899107. The reversal of 1218899100 is 19988121.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218899107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 373074 + ... + 376326.

Almost surely, 2^1218899100 is an apocalyptic number.

1218899100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218899100 is an abundant number, since it is smaller than the sum of its proper divisors (2311690900).

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

1218899100 is a wasteful number, since it uses less digits than its factorization.

1218899100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519 (or 4512 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 1218899100 is about 34912.7354986687. The cubic root of 1218899100 is about 1068.2082278558.

The spelling of 1218899100 in words is "one billion, two hundred eighteen million, eight hundred ninety-nine thousand, one hundred".