1220011996 has 36 divisors (see below), whose sum is σ = 2541371448. Its totient is φ = 510699168.

The previous prime is 1220011981. The next prime is 1220011997. The reversal of 1220011996 is 6991100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220011997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63951 + ... + 80806.

Almost surely, 2^1220011996 is an apocalyptic number.

It is an amenable number.

1220011996 is an abundant number, since it is smaller than the sum of its proper divisors (1321359452).

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

1220011996 is a wasteful number, since it uses less digits than its factorization.

1220011996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144818 (or 144809 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1220011996 is about 34928.6701149643. The cubic root of 1220011996 is about 1068.5332323458.

The spelling of 1220011996 in words is "one billion, two hundred twenty million, eleven thousand, nine hundred ninety-six".