1220001988 has 24 divisors (see below), whose sum is σ = 2180119032. Its totient is φ = 597233664.

The previous prime is 1220001973. The next prime is 1220002019. The reversal of 1220001988 is 8891000221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 398721024 + 821280964 = 19968^2 + 28658^2 .

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 7 ways as a sum of consecutive naturals, for example, 24756 + ... + 55252.

It is an arithmetic number, because the mean of its divisors is an integer number (90838293).

Almost surely, 2^1220001988 is an apocalyptic number.

It is an amenable number.

1220001988 is a deficient number, since it is larger than the sum of its proper divisors (960117044).

1220001988 is a wasteful number, since it uses less digits than its factorization.

1220001988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30711 (or 30709 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1220001988 is about 34928.5268512716. The cubic root of 1220001988 is about 1068.5303105412.

The spelling of 1220001988 in words is "one billion, two hundred twenty million, one thousand, nine hundred eighty-eight".