1221949632 has 56 divisors (see below), whose sum is σ = 3235813696. Its totient is φ = 406971648.

The previous prime is 1221949607. The next prime is 1221949639. The reversal of 1221949632 is 2369491221.

It is not an unprimeable number, because it can be changed into a prime (1221949639) 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 7 ways as a sum of consecutive naturals, for example, 333603 + ... + 337245.

Almost surely, 2^1221949632 is an apocalyptic number.

1221949632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221949632 is an abundant number, since it is smaller than the sum of its proper divisors (2013864064).

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

1221949632 is a wasteful number, since it uses less digits than its factorization.

1221949632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5405 (or 5395 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 1221949632 is about 34956.3961529217. The cubic root of 1221949632 is about 1069.0986184073.

The spelling of 1221949632 in words is "one billion, two hundred twenty-one million, nine hundred forty-nine thousand, six hundred thirty-two".