13891215 has 16 divisors (see below), whose sum is σ = 23935968. Its totient is φ = 6838656.

The previous prime is 13891211. The next prime is 13891217. The reversal of 13891215 is 51219831.

13891215 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13891215 - 2² = 13891211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13891211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35424 + ... + 35813.

It is an arithmetic number, because the mean of its divisors is an integer number (1495998).

Almost surely, 2^13891215 is an apocalyptic number.

13891215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13891215 is a deficient number, since it is larger than the sum of its proper divisors (10044753).

13891215 is a wasteful number, since it uses less digits than its factorization.

13891215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71258.

The product of its digits is 2160, while the sum is 30.

The square root of 13891215 is about 3727.0920299880. The cubic root of 13891215 is about 240.3883469665.

The spelling of 13891215 in words is "thirteen million, eight hundred ninety-one thousand, two hundred fifteen".