13721715 has 60 divisors (see below), whose sum is σ = 27965184. Its totient is φ = 6223392.

The previous prime is 13721713. The next prime is 13721723. The reversal of 13721715 is 51712731.

It is a happy number.

It is not a de Polignac number, because 13721715 - 2¹ = 13721713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13721713) 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 59 ways as a sum of consecutive naturals, for example, 107982 + ... + 108108.

Almost surely, 2^13721715 is an apocalyptic number.

13721715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13721715 is an abundant number, since it is smaller than the sum of its proper divisors (14243469).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13721715 is an equidigital number, since it uses as much as digits as its factorization.

13721715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 142 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 13721715 is about 3704.2833314961. The cubic root of 13721715 is about 239.4066069788.

The spelling of 13721715 in words is "thirteen million, seven hundred twenty-one thousand, seven hundred fifteen".