1309888972 has 72 divisors (see below), whose sum is σ = 2729160000. Its totient is φ = 548333856.

The previous prime is 1309888963. The next prime is 1309888991. The reversal of 1309888972 is 2798889031.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2624779 + ... + 2625277.

It is an arithmetic number, because the mean of its divisors is an integer number (37905000).

Almost surely, 2^1309888972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309888972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1364580000).

1309888972 is an abundant number, since it is smaller than the sum of its proper divisors (1419271028).

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

1309888972 is a wasteful number, since it uses less digits than its factorization.

1309888972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 55.

The square root of 1309888972 is about 36192.3883157771. The cubic root of 1309888972 is about 1094.1532682558.

The spelling of 1309888972 in words is "one billion, three hundred nine million, eight hundred eighty-eight thousand, nine hundred seventy-two".