13640208 has 80 divisors (see below), whose sum is σ = 37497600. Its totient is φ = 4264960.

The previous prime is 13640201. The next prime is 13640213. The reversal of 13640208 is 80204631.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (13640201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56953 + ... + 57191.

It is an arithmetic number, because the mean of its divisors is an integer number (468720).

Almost surely, 2^13640208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13640208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18748800).

13640208 is an abundant number, since it is smaller than the sum of its proper divisors (23857392).

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

13640208 is a wasteful number, since it uses less digits than its factorization.

13640208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 13640208 is about 3693.2652219953. The cubic root of 13640208 is about 238.9316401424.

Adding to 13640208 its reverse (80204631), we get a palindrome (93844839).

The spelling of 13640208 in words is "thirteen million, six hundred forty thousand, two hundred eight".