13143840 has 96 divisors (see below), whose sum is σ = 41912640. Its totient is φ = 3462144.

The previous prime is 13143827. The next prime is 13143847. The reversal of 13143840 is 4834131.

It is a tau number, because it is divible by the number of its divisors (96).

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 13143840.

It is not an unprimeable number, because it can be changed into a prime (13143847) 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, 66622 + ... + 66818.

It is an arithmetic number, because the mean of its divisors is an integer number (436590).

Almost surely, 2^13143840 is an apocalyptic number.

13143840 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 13143840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20956320).

13143840 is an abundant number, since it is smaller than the sum of its proper divisors (28768800).

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

13143840 is a wasteful number, since it uses less digits than its factorization.

13143840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 13143840 is about 3625.4434211555. The cubic root of 13143840 is about 235.9975102677.

Adding to 13143840 its reverse (4834131), we get a palindrome (17977971).

The spelling of 13143840 in words is "thirteen million, one hundred forty-three thousand, eight hundred forty".