13759721 has 4 divisors (see below), whose sum is σ = 13767552. Its totient is φ = 13751892.

The previous prime is 13759693. The next prime is 13759747. The reversal of 13759721 is 12795731.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13759721 - 2¹⁸ = 13497577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13759771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80 + ... + 5246.

It is an arithmetic number, because the mean of its divisors is an integer number (3441888).

Almost surely, 2^13759721 is an apocalyptic number.

It is an amenable number.

13759721 is a deficient number, since it is larger than the sum of its proper divisors (7831).

13759721 is an equidigital number, since it uses as much as digits as its factorization.

13759721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7830.

The product of its digits is 13230, while the sum is 35.

The square root of 13759721 is about 3709.4097913280. The cubic root of 13759721 is about 239.6274369989.

The spelling of 13759721 in words is "thirteen million, seven hundred fifty-nine thousand, seven hundred twenty-one".