13244240 has 20 divisors (see below), whose sum is σ = 30793044. Its totient is φ = 5297664.

The previous prime is 13244233. The next prime is 13244243. The reversal of 13244240 is 4244231.

It can be written as a sum of positive squares in 2 ways, for example, as 3182656 + 10061584 = 1784^2 + 3172^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13244243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82697 + ... + 82856.

Almost surely, 2^13244240 is an apocalyptic number.

13244240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13244240 is an abundant number, since it is smaller than the sum of its proper divisors (17548804).

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

13244240 is a wasteful number, since it uses less digits than its factorization.

13244240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165566 (or 165560 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 13244240 is about 3639.2636617865. The cubic root of 13244240 is about 236.5968803917.

Adding to 13244240 its reverse (4244231), we get a palindrome (17488471).

Subtracting from 13244240 its reverse (4244231), we obtain a palindrome (9000009).

The spelling of 13244240 in words is "thirteen million, two hundred forty-four thousand, two hundred forty".