13950721 has 4 divisors (see below), whose sum is σ = 14044500. Its totient is φ = 13856944.

The previous prime is 13950709. The next prime is 13950733. The reversal of 13950721 is 12705931.

13950721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13950709) and next prime (13950733).

It can be written as a sum of positive squares in 2 ways, for example, as 3459600 + 10491121 = 1860^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 13950721 - 2⁷ = 13950593 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 13950721.

It is not an unprimeable number, because it can be changed into a prime (13950821) 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, 46666 + ... + 46963.

It is an arithmetic number, because the mean of its divisors is an integer number (3511125).

Almost surely, 2^13950721 is an apocalyptic number.

It is an amenable number.

13950721 is a deficient number, since it is larger than the sum of its proper divisors (93779).

13950721 is an equidigital number, since it uses as much as digits as its factorization.

13950721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93778.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 13950721 is about 3735.0663983389. The cubic root of 13950721 is about 240.7311096864.

The spelling of 13950721 in words is "thirteen million, nine hundred fifty thousand, seven hundred twenty-one".