13772218 has 4 divisors (see below), whose sum is σ = 20658330. Its totient is φ = 6886108.

The previous prime is 13772191. The next prime is 13772243. The reversal of 13772218 is 81227731.

13772218 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in only one way, i.e., 10543009 + 3229209 = 3247^2 + 1797^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13772218.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3443053 + ... + 3443056.

Almost surely, 2^13772218 is an apocalyptic number.

13772218 is a deficient number, since it is larger than the sum of its proper divisors (6886112).

13772218 is an equidigital number, since it uses as much as digits as its factorization.

13772218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6886111.

The product of its digits is 4704, while the sum is 31.

The square root of 13772218 is about 3711.0939088091. The cubic root of 13772218 is about 239.6999607062.

Adding to 13772218 its reverse (81227731), we get a palindrome (94999949).

The spelling of 13772218 in words is "thirteen million, seven hundred seventy-two thousand, two hundred eighteen".