13721493 has 4 divisors (see below), whose sum is σ = 18295328. Its totient is φ = 9147660.

The previous prime is 13721479. The next prime is 13721497. The reversal of 13721493 is 39412731.

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.

It is not a de Polignac number, because 13721493 - 2⁸ = 13721237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13721493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13721497) 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, 2286913 + ... + 2286918.

It is an arithmetic number, because the mean of its divisors is an integer number (4573832).

Almost surely, 2^13721493 is an apocalyptic number.

It is an amenable number.

13721493 is a deficient number, since it is larger than the sum of its proper divisors (4573835).

13721493 is an equidigital number, since it uses as much as digits as its factorization.

13721493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4573834.

The product of its digits is 4536, while the sum is 30.

The square root of 13721493 is about 3704.2533660645. The cubic root of 13721493 is about 239.4053158731.

The spelling of 13721493 in words is "thirteen million, seven hundred twenty-one thousand, four hundred ninety-three".