13721975 has 24 divisors (see below), whose sum is σ = 18280080. Its totient is φ = 10181120.

The previous prime is 13721927. The next prime is 13721987. The reversal of 13721975 is 57912731.

It is a happy number.

13721975 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13721975 - 2¹⁴ = 13705591 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 35081 + ... + 35469.

It is an arithmetic number, because the mean of its divisors is an integer number (761670).

Almost surely, 2^13721975 is an apocalyptic number.

13721975 is a deficient number, since it is larger than the sum of its proper divisors (4558105).

13721975 is a wasteful number, since it uses less digits than its factorization.

13721975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499 (or 494 counting only the distinct ones).

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

The square root of 13721975 is about 3704.3184258376. The cubic root of 13721975 is about 239.4081190669.

The spelling of 13721975 in words is "thirteen million, seven hundred twenty-one thousand, nine hundred seventy-five".