12943840 has 144 divisors (see below), whose sum is σ = 38610432. Its totient is φ = 4064256.

The previous prime is 12943829. The next prime is 12943867. The reversal of 12943840 is 4834921.

12943840 = T₃₄₄ + T₃₄₅ + ... + T₄₉₀.

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, 101857 + ... + 101983.

It is an arithmetic number, because the mean of its divisors is an integer number (268128).

Almost surely, 2^12943840 is an apocalyptic number.

12943840 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 12943840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19305216).

12943840 is an abundant number, since it is smaller than the sum of its proper divisors (25666592).

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

12943840 is a wasteful number, since it uses less digits than its factorization.

12943840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 12943840 is about 3597.7548554619. The cubic root of 12943840 is about 234.7943878307.

The spelling of 12943840 in words is "twelve million, nine hundred forty-three thousand, eight hundred forty".