1309298940 has 72 divisors (see below), whose sum is σ = 3979711008. Its totient is φ = 348428160.

The previous prime is 1309298929. The next prime is 1309299037. The reversal of 1309298940 is 498929031.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 83310 + ... + 97770.

It is an arithmetic number, because the mean of its divisors is an integer number (55273764).

Almost surely, 2^1309298940 is an apocalyptic number.

1309298940 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 1309298940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1989855504).

1309298940 is an abundant number, since it is smaller than the sum of its proper divisors (2670412068).

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

1309298940 is a wasteful number, since it uses less digits than its factorization.

1309298940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14979 (or 14974 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1309298940 is about 36184.2360704216. The cubic root of 1309298940 is about 1093.9889585540.

The spelling of 1309298940 in words is "one billion, three hundred nine million, two hundred ninety-eight thousand, nine hundred forty".