1438218 has 12 divisors (see below), whose sum is σ = 3116178. Its totient is φ = 479400.

The previous prime is 1438211. The next prime is 1438223. The reversal of 1438218 is 8128341.

It can be written as a sum of positive squares in only one way, i.e., 1306449 + 131769 = 1143^2 + 363^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1438191 and 1438200.

It is not an unprimeable number, because it can be changed into a prime (1438211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39933 + ... + 39968.

2^1438218 is an apocalyptic number.

1438218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1438218 is an abundant number, since it is smaller than the sum of its proper divisors (1677960).

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

1438218 is a wasteful number, since it uses less digits than its factorization.

1438218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79909 (or 79906 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 1438218 is about 1199.2572701468. The cubic root of 1438218 is about 112.8777229543.

It can be divided in two parts, 14382 and 18, that added together give a square (14400 = 120²).

The spelling of 1438218 in words is "one million, four hundred thirty-eight thousand, two hundred eighteen".