1309903320 has 256 divisors, whose sum is σ = 4670784000. Its totient is φ = 290304000.

The previous prime is 1309903319. The next prime is 1309903327. The reversal of 1309903320 is 233099031.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309903327) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 726420 + ... + 728220.

It is an arithmetic number, because the mean of its divisors is an integer number (18245250).

Almost surely, 2^1309903320 is an apocalyptic number.

1309903320 is a gapful number since it is divisible by the number (10) 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 1309903320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2335392000).

1309903320 is an abundant number, since it is smaller than the sum of its proper divisors (3360880680).

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

1309903320 is a wasteful number, since it uses less digits than its factorization.

1309903320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874 (or 1870 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 1309903320 is about 36192.5865337088. The cubic root of 1309903320 is about 1094.1572632136.

The spelling of 1309903320 in words is "one billion, three hundred nine million, nine hundred three thousand, three hundred twenty".