13640224 has 24 divisors (see below), whose sum is σ = 28920780. Its totient is φ = 6295296.

The previous prime is 13640213. The next prime is 13640257. The reversal of 13640224 is 42204631.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13104400 + 535824 = 3620^2 + 732^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13640195 and 13640204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15979 + ... + 16810.

Almost surely, 2^13640224 is an apocalyptic number.

It is an amenable number.

13640224 is an abundant number, since it is smaller than the sum of its proper divisors (15280556).

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

13640224 is a wasteful number, since it uses less digits than its factorization.

13640224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32812 (or 32804 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 13640224 is about 3693.2673880996. The cubic root of 13640224 is about 238.9317335649.

Adding to 13640224 its reverse (42204631), we get a palindrome (55844855).

The spelling of 13640224 in words is "thirteen million, six hundred forty thousand, two hundred twenty-four".