13143720 has 96 divisors (see below), whose sum is σ = 41997600. Its totient is φ = 3290112.

The previous prime is 13143719. The next prime is 13143743. The reversal of 13143720 is 2734131.

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, 34491 + ... + 34869.

It is an arithmetic number, because the mean of its divisors is an integer number (437475).

Almost surely, 2^13143720 is an apocalyptic number.

13143720 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 13143720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20998800).

13143720 is an abundant number, since it is smaller than the sum of its proper divisors (28853880).

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

13143720 is a wasteful number, since it uses less digits than its factorization.

13143720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 13143720 is about 3625.4268714180. The cubic root of 13143720 is about 235.9967920659.

Adding to 13143720 its reverse (2734131), we get a palindrome (15877851).

The spelling of 13143720 in words is "thirteen million, one hundred forty-three thousand, seven hundred twenty".