1309868 has 36 divisors (see below), whose sum is σ = 2748312. Its totient is φ = 544320.

The previous prime is 1309849. The next prime is 1309877. The reversal of 1309868 is 8689031.

1309868 = T₂₃₂ + T₂₃₃ + ... + T₂₇₂.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7955 + ... + 8117.

It is an arithmetic number, because the mean of its divisors is an integer number (76342).

2^1309868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374156).

1309868 is an abundant number, since it is smaller than the sum of its proper divisors (1438444).

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

1309868 is a wasteful number, since it uses less digits than its factorization.

1309868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1309868 is about 1144.4946483055. The cubic root of 1309868 is about 109.4147428905.

The spelling of 1309868 in words is "one million, three hundred nine thousand, eight hundred sixty-eight".