13142440 has 32 divisors (see below), whose sum is σ = 29952000. Its totient is φ = 5189184.

The previous prime is 13142431. The next prime is 13142443. The reversal of 13142440 is 4424131.

It is not an unprimeable number, because it can be changed into a prime (13142443) 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, 1081 + ... + 5239.

It is an arithmetic number, because the mean of its divisors is an integer number (936000).

Almost surely, 2^13142440 is an apocalyptic number.

13142440 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 13142440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14976000).

13142440 is an abundant number, since it is smaller than the sum of its proper divisors (16809560).

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

13142440 is a wasteful number, since it uses less digits than its factorization.

13142440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249 (or 4245 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 13142440 is about 3625.2503361837. The cubic root of 13142440 is about 235.9891309751.

Adding to 13142440 its reverse (4424131), we get a palindrome (17566571).

The spelling of 13142440 in words is "thirteen million, one hundred forty-two thousand, four hundred forty".