13808621 has 8 divisors (see below), whose sum is σ = 13990584. Its totient is φ = 13628160.

The previous prime is 13808603. The next prime is 13808623. The reversal of 13808621 is 12680831.

It can be written as a sum of positive squares in 4 ways, for example, as 7396 + 13801225 = 86^2 + 3715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13808621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13808623) 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, 43961 + ... + 44273.

It is an arithmetic number, because the mean of its divisors is an integer number (1748823).

Almost surely, 2^13808621 is an apocalyptic number.

It is an amenable number.

13808621 is a deficient number, since it is larger than the sum of its proper divisors (181963).

13808621 is a wasteful number, since it uses less digits than its factorization.

13808621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 13808621 is about 3715.9952906321. The cubic root of 13808621 is about 239.9109681337.

It can be divided in two parts, 1380 and 8621, that added together give a palindrome (10001).

The spelling of 13808621 in words is "thirteen million, eight hundred eight thousand, six hundred twenty-one".