1220163912 has 80 divisors (see below), whose sum is σ = 3728300400. Its totient is φ = 369744480.

The previous prime is 1220163887. The next prime is 1220163929. The reversal of 1220163912 is 2193610221.

1220163912 is a `hidden beast` number, since 1 + 2 + 20 + 1 + 639 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 19 ways as a sum of consecutive naturals, for example, 78462 + ... + 92717.

It is an arithmetic number, because the mean of its divisors is an integer number (46603755).

Almost surely, 2^1220163912 is an apocalyptic number.

1220163912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220163912 is an abundant number, since it is smaller than the sum of its proper divisors (2508136488).

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

1220163912 is a wasteful number, since it uses less digits than its factorization.

1220163912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171208 (or 171195 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1220163912 is about 34930.8447077937. The cubic root of 1220163912 is about 1068.5775817887.

The spelling of 1220163912 in words is "one billion, two hundred twenty million, one hundred sixty-three thousand, nine hundred twelve".