1221806992 has 40 divisors (see below), whose sum is σ = 2708505216. Its totient is φ = 523036416.

The previous prime is 1221806981. The next prime is 1221807029. The reversal of 1221806992 is 2996081221.

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, 101013 + ... + 112459.

Almost surely, 2^1221806992 is an apocalyptic number.

It is an amenable number.

1221806992 is an abundant number, since it is smaller than the sum of its proper divisors (1486698224).

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

1221806992 is a wasteful number, since it uses less digits than its factorization.

1221806992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12415 (or 12409 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1221806992 is about 34954.3558372916. The cubic root of 1221806992 is about 1069.0570176306.

The spelling of 1221806992 in words is "one billion, two hundred twenty-one million, eight hundred six thousand, nine hundred ninety-two".