13640244 has 24 divisors (see below), whose sum is σ = 32073888. Its totient is φ = 4511520.

The previous prime is 13640213. The next prime is 13640257. The reversal of 13640244 is 44204631.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2767 + ... + 5910.

It is an arithmetic number, because the mean of its divisors is an integer number (1336412).

Almost surely, 2^13640244 is an apocalyptic number.

It is an amenable number.

13640244 is an abundant number, since it is smaller than the sum of its proper divisors (18433644).

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

13640244 is a wasteful number, since it uses less digits than its factorization.

13640244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8815 (or 8813 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 13640244 is about 3693.2700957282. The cubic root of 13640244 is about 238.9318503428.

Adding to 13640244 its reverse (44204631), we get a palindrome (57844875).

The spelling of 13640244 in words is "thirteen million, six hundred forty thousand, two hundred forty-four".