13881715 has 4 divisors (see below), whose sum is σ = 16658064. Its totient is φ = 11105368.

The previous prime is 13881713. The next prime is 13881737. The reversal of 13881715 is 51718831.

13881715 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51718831 = 53 ⋅975827.

It is a cyclic number.

It is not a de Polignac number, because 13881715 - 2¹ = 13881713 is a prime.

It is a super-2 number, since 2×13881715² = 385404022682450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13881713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1388167 + ... + 1388176.

It is an arithmetic number, because the mean of its divisors is an integer number (4164516).

Almost surely, 2^13881715 is an apocalyptic number.

13881715 is a deficient number, since it is larger than the sum of its proper divisors (2776349).

13881715 is an equidigital number, since it uses as much as digits as its factorization.

13881715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776348.

The product of its digits is 6720, while the sum is 34.

The square root of 13881715 is about 3725.8173599896. The cubic root of 13881715 is about 240.3335351043. Note that the first 3 decimals are identical.

The spelling of 13881715 in words is "thirteen million, eight hundred eighty-one thousand, seven hundred fifteen".