1229721960 has 32 divisors (see below), whose sum is σ = 3689166240. Its totient is φ = 327925824.

The previous prime is 1229721949. The next prime is 1229721991. The reversal of 1229721960 is 691279221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5123722 + ... + 5123961.

It is an arithmetic number, because the mean of its divisors is an integer number (115286445).

Almost surely, 2^1229721960 is an apocalyptic number.

1229721960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1229721960 is an abundant number, since it is smaller than the sum of its proper divisors (2459444280).

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

1229721960 is a wasteful number, since it uses less digits than its factorization.

1229721960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10247697 (or 10247693 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 1229721960 is about 35067.3916908572. The cubic root of 1229721960 is about 1071.3605309427.

The spelling of 1229721960 in words is "one billion, two hundred twenty-nine million, seven hundred twenty-one thousand, nine hundred sixty".