13775218 has 4 divisors (see below), whose sum is σ = 20662830. Its totient is φ = 6887608.

The previous prime is 13775197. The next prime is 13775233. The reversal of 13775218 is 81257731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81257731 = 7121 ⋅11411.

It can be written as a sum of positive squares in only one way, i.e., 13446889 + 328329 = 3667^2 + 573^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3443803 + ... + 3443806.

Almost surely, 2^13775218 is an apocalyptic number.

13775218 is a deficient number, since it is larger than the sum of its proper divisors (6887612).

13775218 is an equidigital number, since it uses as much as digits as its factorization.

13775218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6887611.

The product of its digits is 11760, while the sum is 34.

The square root of 13775218 is about 3711.4980802905. The cubic root of 13775218 is about 239.7173640437.

The spelling of 13775218 in words is "thirteen million, seven hundred seventy-five thousand, two hundred eighteen".