13721915 has 8 divisors (see below), whose sum is σ = 17182368. Its totient is φ = 10500160.

The previous prime is 13721891. The next prime is 13721927. The reversal of 13721915 is 51912731.

13721915 is digitally balanced in base 2, because in such base 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 not a de Polignac number, because 13721915 - 2¹⁰ = 13720891 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59546 + ... + 59775.

It is an arithmetic number, because the mean of its divisors is an integer number (2147796).

Almost surely, 2^13721915 is an apocalyptic number.

13721915 is a deficient number, since it is larger than the sum of its proper divisors (3460453).

13721915 is a wasteful number, since it uses less digits than its factorization.

13721915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119349.

The product of its digits is 1890, while the sum is 29.

The square root of 13721915 is about 3704.3103271729. The cubic root of 13721915 is about 239.4077701252.

The spelling of 13721915 in words is "thirteen million, seven hundred twenty-one thousand, nine hundred fifteen".