18355226 has 8 divisors (see below), whose sum is σ = 27567540. Its totient is φ = 9166048.

The previous prime is 18355199. The next prime is 18355229. The reversal of 18355226 is 62255381.

It can be written as a sum of positive squares in 2 ways, for example, as 13315201 + 5040025 = 3649^2 + 2245^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18355226² = 673828643022152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18355192 and 18355201.

It is not an unprimeable number, because it can be changed into a prime (18355229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3641 + ... + 7068.

Almost surely, 2^18355226 is an apocalyptic number.

18355226 is a deficient number, since it is larger than the sum of its proper divisors (9212314).

18355226 is a wasteful number, since it uses less digits than its factorization.

18355226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11568.

The product of its digits is 14400, while the sum is 32.

The square root of 18355226 is about 4284.2999428145. The cubic root of 18355226 is about 263.7869129172.

It can be divided in two parts, 18355 and 226, that added together give a palindrome (18581).

The spelling of 18355226 in words is "eighteen million, three hundred fifty-five thousand, two hundred twenty-six".