1243666220 has 12 divisors (see below), whose sum is σ = 2611699104. Its totient is φ = 497466480.

The previous prime is 1243666211. The next prime is 1243666267. The reversal of 1243666220 is 226663421.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31091636 + ... + 31091675.

It is an arithmetic number, because the mean of its divisors is an integer number (217641592).

Almost surely, 2^1243666220 is an apocalyptic number.

1243666220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243666220 is an abundant number, since it is smaller than the sum of its proper divisors (1368032884).

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

1243666220 is a wasteful number, since it uses less digits than its factorization.

1243666220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62183320 (or 62183318 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 1243666220 is about 35265.6521278141. The cubic root of 1243666220 is about 1075.3948345929.

The spelling of 1243666220 in words is "one billion, two hundred forty-three million, six hundred sixty-six thousand, two hundred twenty".