1289919972 has 24 divisors (see below), whose sum is σ = 3283432992. Its totient is φ = 390884800.

The previous prime is 1289919959. The next prime is 1289919991. The reversal of 1289919972 is 2799199821.

1289919972 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4885929 + ... + 4886192.

It is an arithmetic number, because the mean of its divisors is an integer number (136809708).

Almost surely, 2^1289919972 is an apocalyptic number.

1289919972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1289919972 is an abundant number, since it is smaller than the sum of its proper divisors (1993513020).

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

1289919972 is a wasteful number, since it uses less digits than its factorization.

1289919972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9772139 (or 9772137 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 57.

The square root of 1289919972 is about 35915.4558929718. The cubic root of 1289919972 is about 1088.5647220161.

The spelling of 1289919972 in words is "one billion, two hundred eighty-nine million, nine hundred nineteen thousand, nine hundred seventy-two".