1218039100 has 18 divisors (see below), whose sum is σ = 2643145064. Its totient is φ = 487215600.

The previous prime is 1218039089. The next prime is 1218039131. The reversal of 1218039100 is 19308121.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6090096 + ... + 6090295.

Almost surely, 2^1218039100 is an apocalyptic number.

1218039100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218039100 is an abundant number, since it is smaller than the sum of its proper divisors (1425105964).

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

1218039100 is a wasteful number, since it uses less digits than its factorization.

1218039100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12180405 (or 12180398 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1218039100 is about 34900.4169029540. The cubic root of 1218039100 is about 1067.9569422994.

The spelling of 1218039100 in words is "one billion, two hundred eighteen million, thirty-nine thousand, one hundred".