13850721 has 12 divisors (see below), whose sum is σ = 20335380. Its totient is φ = 9082080.

The previous prime is 13850717. The next prime is 13850723. The reversal of 13850721 is 12705831.

13850721 is a `hidden beast` number, since 138 + 507 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 608400 + 13242321 = 780^2 + 3639^2 .

It is not a de Polignac number, because 13850721 - 2² = 13850717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13850723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12066 + ... + 13163.

It is an arithmetic number, because the mean of its divisors is an integer number (1694615).

Almost surely, 2^13850721 is an apocalyptic number.

It is an amenable number.

13850721 is a deficient number, since it is larger than the sum of its proper divisors (6484659).

13850721 is a wasteful number, since it uses less digits than its factorization.

13850721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25296 (or 25293 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 13850721 is about 3721.6556799360. The cubic root of 13850721 is about 240.1545358897.

The spelling of 13850721 in words is "thirteen million, eight hundred fifty thousand, seven hundred twenty-one".