1309389340 has 24 divisors (see below), whose sum is σ = 3142534752. Its totient is φ = 448933440.

The previous prime is 1309389331. The next prime is 1309389359. The reversal of 1309389340 is 439839031.

It is a junction number, because it is equal to n+sod(n) for n = 1309389293 and 1309389302.

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, 4676251 + ... + 4676530.

It is an arithmetic number, because the mean of its divisors is an integer number (130938948).

Almost surely, 2^1309389340 is an apocalyptic number.

1309389340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1309389340 is an abundant number, since it is smaller than the sum of its proper divisors (1833145412).

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

1309389340 is a wasteful number, since it uses less digits than its factorization.

1309389340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9352797 (or 9352795 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 1309389340 is about 36185.4852116149. The cubic root of 1309389340 is about 1094.0141359786.

The spelling of 1309389340 in words is "one billion, three hundred nine million, three hundred eighty-nine thousand, three hundred forty".