1308840 has 64 divisors (see below), whose sum is σ = 4233600. Its totient is φ = 321792.

The previous prime is 1308829. The next prime is 1308841. The reversal of 1308840 is 488031.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1308840.

It is not an unprimeable number, because it can be changed into a prime (1308841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1141 + ... + 1979.

It is an arithmetic number, because the mean of its divisors is an integer number (66150).

2^1308840 is an apocalyptic number.

1308840 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 1308840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2116800).

1308840 is an abundant number, since it is smaller than the sum of its proper divisors (2924760).

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

1308840 is a wasteful number, since it uses less digits than its factorization.

1308840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 1308840 is about 1144.0454536425. The cubic root of 1308840 is about 109.3861120683.

The spelling of 1308840 in words is "one million, three hundred eight thousand, eight hundred forty".