13768621 has 4 divisors (see below), whose sum is σ = 13934592. Its totient is φ = 13602652.

The previous prime is 13768609. The next prime is 13768627. The reversal of 13768621 is 12686731.

13768621 = T₅₃₄ + T₅₃₅ + ... + T₆₁₆.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12686731 = 23 ⋅551597.

It is a cyclic number.

It is not a de Polignac number, because 13768621 - 2⁹ = 13768109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13768627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82861 + ... + 83026.

It is an arithmetic number, because the mean of its divisors is an integer number (3483648).

Almost surely, 2^13768621 is an apocalyptic number.

It is an amenable number.

13768621 is a deficient number, since it is larger than the sum of its proper divisors (165971).

13768621 is an equidigital number, since it uses as much as digits as its factorization.

13768621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165970.

The product of its digits is 12096, while the sum is 34.

The square root of 13768621 is about 3710.6092491665. The cubic root of 13768621 is about 239.6790907725.

The spelling of 13768621 in words is "thirteen million, seven hundred sixty-eight thousand, six hundred twenty-one".