1309643472 has 40 divisors (see below), whose sum is σ = 3384756576. Its totient is φ = 436352896.

The previous prime is 1309643459. The next prime is 1309643497. The reversal of 1309643472 is 2743469031.

It is a self number, because there is not a number n which added to its sum of digits gives 1309643472.

It is a congruent number.

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, 137323 + ... + 146549.

Almost surely, 2^1309643472 is an apocalyptic number.

1309643472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1309643472 is an abundant number, since it is smaller than the sum of its proper divisors (2075113104).

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

1309643472 is a wasteful number, since it uses less digits than its factorization.

1309643472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12195 (or 12189 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 1309643472 is about 36188.9965597279. The cubic root of 1309643472 is about 1094.0849084135.

The spelling of 1309643472 in words is "one billion, three hundred nine million, six hundred forty-three thousand, four hundred seventy-two".