13143440 has 40 divisors (see below), whose sum is σ = 32170560. Its totient is φ = 4980096.

The previous prime is 13143407. The next prime is 13143443. The reversal of 13143440 is 4434131.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (13143443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2804 + ... + 5843.

It is an arithmetic number, because the mean of its divisors is an integer number (804264).

Almost surely, 2^13143440 is an apocalyptic number.

13143440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13143440 is an abundant number, since it is smaller than the sum of its proper divisors (19027120).

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

13143440 is a wasteful number, since it uses less digits than its factorization.

13143440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8679 (or 8673 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 13143440 is about 3625.3882550701. The cubic root of 13143440 is about 235.9951162448.

Adding to 13143440 its reverse (4434131), we get a palindrome (17577571).

The spelling of 13143440 in words is "thirteen million, one hundred forty-three thousand, four hundred forty".