13958721 has 12 divisors (see below), whose sum is σ = 23043072. Its totient is φ = 7976376.

The previous prime is 13958701. The next prime is 13958729. The reversal of 13958721 is 12785931.

It is not a de Polignac number, because 13958721 - 2⁵ = 13958689 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (13958729) 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 11 ways as a sum of consecutive naturals, for example, 110721 + ... + 110846.

It is an arithmetic number, because the mean of its divisors is an integer number (1920256).

Almost surely, 2^13958721 is an apocalyptic number.

It is an amenable number.

13958721 is a deficient number, since it is larger than the sum of its proper divisors (9084351).

13958721 is a wasteful number, since it uses less digits than its factorization.

13958721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221580 (or 221577 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 13958721 is about 3736.1371762825. The cubic root of 13958721 is about 240.7771164095. Note that the first 3 decimals are identical.

The spelling of 13958721 in words is "thirteen million, nine hundred fifty-eight thousand, seven hundred twenty-one".