1209727872 has 384 divisors, whose sum is σ = 4009824000. Its totient is φ = 361304064.

The previous prime is 1209727859. The next prime is 1209727873. The reversal of 1209727872 is 2787279021.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209727873) 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 47 ways as a sum of consecutive naturals, for example, 13592404 + ... + 13592492.

It is an arithmetic number, because the mean of its divisors is an integer number (10442250).

Almost surely, 2^1209727872 is an apocalyptic number.

1209727872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209727872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2004912000).

1209727872 is an abundant number, since it is smaller than the sum of its proper divisors (2800096128).

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

1209727872 is an equidigital number, since it uses as much as digits as its factorization.

1209727872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 1209727872 is about 34781.1424769227. The cubic root of 1209727872 is about 1065.5223464231.

The spelling of 1209727872 in words is "one billion, two hundred nine million, seven hundred twenty-seven thousand, eight hundred seventy-two".