13721447 has 2 divisors, whose sum is σ = 13721448. Its totient is φ = 13721446.

The previous prime is 13721443. The next prime is 13721459. The reversal of 13721447 is 74412731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13721447 - 2² = 13721443 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13721441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6860723 + 6860724.

It is an arithmetic number, because the mean of its divisors is an integer number (6860724).

Almost surely, 2^13721447 is an apocalyptic number.

13721447 is a deficient number, since it is larger than the sum of its proper divisors (1).

13721447 is an equidigital number, since it uses as much as digits as its factorization.

13721447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 29.

The square root of 13721447 is about 3704.2471569808. The cubic root of 13721447 is about 239.4050483450.

The spelling of 13721447 in words is "thirteen million, seven hundred twenty-one thousand, four hundred forty-seven".