1289438952 has 64 divisors (see below), whose sum is σ = 3441139200. Its totient is φ = 401446080.

The previous prime is 1289438951. The next prime is 1289438963. The reversal of 1289438952 is 2598349821.

1289438952 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1289438895 and 1289438904.

It is not an unprimeable number, because it can be changed into a prime (1289438951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12463 + ... + 52289.

It is an arithmetic number, because the mean of its divisors is an integer number (53767800).

Almost surely, 2^1289438952 is an apocalyptic number.

1289438952 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 1289438952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1720569600).

1289438952 is an abundant number, since it is smaller than the sum of its proper divisors (2151700248).

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

1289438952 is a wasteful number, since it uses less digits than its factorization.

1289438952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39926 (or 39922 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 51.

The square root of 1289438952 is about 35908.7587087050. The cubic root of 1289438952 is about 1088.4293941108.

The spelling of 1289438952 in words is "one billion, two hundred eighty-nine million, four hundred thirty-eight thousand, nine hundred fifty-two".