1218949020 has 48 divisors (see below), whose sum is σ = 3792287520. Its totient is φ = 325052928.

The previous prime is 1218949013. The next prime is 1218949049. The reversal of 1218949020 is 209498121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1128117 + ... + 1129196.

It is an arithmetic number, because the mean of its divisors is an integer number (79005990).

Almost surely, 2^1218949020 is an apocalyptic number.

1218949020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218949020 is an abundant number, since it is smaller than the sum of its proper divisors (2573338500).

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

1218949020 is a wasteful number, since it uses less digits than its factorization.

1218949020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257331 (or 2257323 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1218949020 is about 34913.4504167090. The cubic root of 1218949020 is about 1068.2228104757. Note that the first 3 decimals are identical.

The spelling of 1218949020 in words is "one billion, two hundred eighteen million, nine hundred forty-nine thousand, twenty".