13820515 has 8 divisors (see below), whose sum is σ = 16639488. Its totient is φ = 11019840.

The previous prime is 13820509. The next prime is 13820531. The reversal of 13820515 is 51502831.

It is a happy number.

13820515 is digitally balanced in base 2 and base 3, 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 not a de Polignac number, because 13820515 - 2⁵ = 13820483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13820515.

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, 2851 + ... + 5980.

It is an arithmetic number, because the mean of its divisors is an integer number (2079936).

Almost surely, 2^13820515 is an apocalyptic number.

13820515 is a deficient number, since it is larger than the sum of its proper divisors (2818973).

13820515 is an equidigital number, since it uses as much as digits as its factorization.

13820515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9149.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 13820515 is about 3717.5953249379. The cubic root of 13820515 is about 239.9798304809.

The spelling of 13820515 in words is "thirteen million, eight hundred twenty thousand, five hundred fifteen".