13797721 has 8 divisors (see below), whose sum is σ = 15833664. Its totient is φ = 11778000.

The previous prime is 13797701. The next prime is 13797731. The reversal of 13797721 is 12779731.

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 13797721 - 2¹¹ = 13795673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13797701) 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 7 ways as a sum of consecutive naturals, for example, 2170 + ... + 5683.

It is an arithmetic number, because the mean of its divisors is an integer number (1979208).

Almost surely, 2^13797721 is an apocalyptic number.

It is an amenable number.

13797721 is a deficient number, since it is larger than the sum of its proper divisors (2035943).

13797721 is an equidigital number, since it uses as much as digits as its factorization.

13797721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8111.

The product of its digits is 18522, while the sum is 37.

The square root of 13797721 is about 3714.5283684473. The cubic root of 13797721 is about 239.8478259869.

The spelling of 13797721 in words is "thirteen million, seven hundred ninety-seven thousand, seven hundred twenty-one".