14857721 has 2 divisors, whose sum is σ = 14857722. Its totient is φ = 14857720.

The previous prime is 14857697. The next prime is 14857723. The reversal of 14857721 is 12775841.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11833600 + 3024121 = 3440^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 14857721 - 2¹⁸ = 14595577 is a prime.

Together with 14857723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (14857723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7428860 + 7428861.

It is an arithmetic number, because the mean of its divisors is an integer number (7428861).

Almost surely, 2^14857721 is an apocalyptic number.

It is an amenable number.

14857721 is a deficient number, since it is larger than the sum of its proper divisors (1).

14857721 is an equidigital number, since it uses as much as digits as its factorization.

14857721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 35.

The square root of 14857721 is about 3854.5714418078. The cubic root of 14857721 is about 245.8389729882.

The spelling of 14857721 in words is "fourteen million, eight hundred fifty-seven thousand, seven hundred twenty-one".