13449721 has 4 divisors (see below), whose sum is σ = 13538944. Its totient is φ = 13360500.

The previous prime is 13449697. The next prime is 13449727. The reversal of 13449721 is 12794431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13449721 - 2⁹ = 13449209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13449727) 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, 44385 + ... + 44686.

It is an arithmetic number, because the mean of its divisors is an integer number (3384736).

Almost surely, 2^13449721 is an apocalyptic number.

It is an amenable number.

13449721 is a deficient number, since it is larger than the sum of its proper divisors (89223).

13449721 is an equidigital number, since it uses as much as digits as its factorization.

13449721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89222.

The product of its digits is 6048, while the sum is 31.

The square root of 13449721 is about 3667.3861263848. The cubic root of 13449721 is about 237.8141865829.

The spelling of 13449721 in words is "thirteen million, four hundred forty-nine thousand, seven hundred twenty-one".