13673721 has 8 divisors (see below), whose sum is σ = 18273024. Its totient is φ = 9095120.

The previous prime is 13673719. The next prime is 13673731. The reversal of 13673721 is 12737631.

13673721 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13673721 - 2¹ = 13673719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13673701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3561 + ... + 6326.

It is an arithmetic number, because the mean of its divisors is an integer number (2284128).

Almost surely, 2^13673721 is an apocalyptic number.

It is an amenable number.

13673721 is a deficient number, since it is larger than the sum of its proper divisors (4599303).

13673721 is an equidigital number, since it uses as much as digits as its factorization.

13673721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10351.

The product of its digits is 5292, while the sum is 30.

The square root of 13673721 is about 3697.7994807723. The cubic root of 13673721 is about 239.1271593309.

The spelling of 13673721 in words is "thirteen million, six hundred seventy-three thousand, seven hundred twenty-one".