13721799 has 16 divisors (see below), whose sum is σ = 22518272. Its totient is φ = 7237728.

The previous prime is 13721789. The next prime is 13721833. The reversal of 13721799 is 99712731.

It is not a de Polignac number, because 13721799 - 2⁷ = 13721671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13721779) 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 15 ways as a sum of consecutive naturals, for example, 24859 + ... + 25404.

It is an arithmetic number, because the mean of its divisors is an integer number (1407392).

Almost surely, 2^13721799 is an apocalyptic number.

13721799 is a deficient number, since it is larger than the sum of its proper divisors (8796473).

13721799 is a wasteful number, since it uses less digits than its factorization.

13721799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50286.

The product of its digits is 23814, while the sum is 39.

The square root of 13721799 is about 3704.2946697043. The cubic root of 13721799 is about 239.4070955017.

The spelling of 13721799 in words is "thirteen million, seven hundred twenty-one thousand, seven hundred ninety-nine".