1309880 has 64 divisors (see below), whose sum is σ = 3477600. Its totient is φ = 437760.

The previous prime is 1309877. The next prime is 1309883. The reversal of 1309880 is 889031.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1309877) and next prime (1309883).

It is a super-2 number, since 2×1309880² = 3431571228800, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5606 + ... + 5834.

2^1309880 is an apocalyptic number.

1309880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 1144×1145.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1738800).

1309880 is an abundant number, since it is smaller than the sum of its proper divisors (2167720).

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

1309880 is a wasteful number, since it uses less digits than its factorization.

1309880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1309880 is about 1144.4998907820. The cubic root of 1309880 is about 109.4150770139.

The spelling of 1309880 in words is "one million, three hundred nine thousand, eight hundred eighty".