1309740 has 48 divisors (see below), whose sum is σ = 3725568. Its totient is φ = 343744.

The previous prime is 1309739. The next prime is 1309747. The reversal of 1309740 is 479031.

It is a self number, because there is not a number n which added to its sum of digits gives 1309740.

It is not an unprimeable number, because it can be changed into a prime (1309747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4849 + ... + 5111.

It is an arithmetic number, because the mean of its divisors is an integer number (77616).

2^1309740 is an apocalyptic number.

1309740 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 1309740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1862784).

1309740 is an abundant number, since it is smaller than the sum of its proper divisors (2415828).

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

1309740 is a wasteful number, since it uses less digits than its factorization.

1309740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 1309740 is about 1144.4387270623. The cubic root of 1309740 is about 109.4111787799.

It can be divided in two parts, 130 and 9740, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 1309740 in words is "one million, three hundred nine thousand, seven hundred forty".