13891218 has 32 divisors (see below), whose sum is σ = 31629312. Its totient is φ = 4026000.

The previous prime is 13891217. The next prime is 13891231. The reversal of 13891218 is 81219831.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 3058 + ... + 6093.

It is an arithmetic number, because the mean of its divisors is an integer number (988416).

Almost surely, 2^13891218 is an apocalyptic number.

13891218 is an abundant number, since it is smaller than the sum of its proper divisors (17738094).

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

13891218 is a wasteful number, since it uses less digits than its factorization.

13891218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9190.

The product of its digits is 3456, while the sum is 33.

The square root of 13891218 is about 3727.0924324465. The cubic root of 13891218 is about 240.3883642715.

The spelling of 13891218 in words is "thirteen million, eight hundred ninety-one thousand, two hundred eighteen".