1220201988 has 12 divisors (see below), whose sum is σ = 2847138000. Its totient is φ = 406733992.

The previous prime is 1220201981. The next prime is 1220201993. The reversal of 1220201988 is 8891020221.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1220201981) by changing a digit.

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, 50841738 + ... + 50841761.

It is an arithmetic number, because the mean of its divisors is an integer number (237261500).

Almost surely, 2^1220201988 is an apocalyptic number.

It is an amenable number.

1220201988 is an abundant number, since it is smaller than the sum of its proper divisors (1626936012).

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

1220201988 is a wasteful number, since it uses less digits than its factorization.

1220201988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101683506 (or 101683504 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 1220201988 is about 34931.3897232847. The cubic root of 1220201988 is about 1068.5886968901.

The spelling of 1220201988 in words is "one billion, two hundred twenty million, two hundred one thousand, nine hundred eighty-eight".