18212605 has 8 divisors (see below), whose sum is σ = 21879000. Its totient is φ = 14554176.

The previous prime is 18212561. The next prime is 18212617. The reversal of 18212605 is 50621281.

It can be written as a sum of positive squares in 4 ways, for example, as 1737124 + 16475481 = 1318^2 + 4059^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18212605 - 2⁷ = 18212477 is a prime.

It is a super-3 number, since 3×18212605³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18212605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5871 + ... + 8419.

It is an arithmetic number, because the mean of its divisors is an integer number (2734875).

Almost surely, 2^18212605 is an apocalyptic number.

It is an amenable number.

18212605 is a deficient number, since it is larger than the sum of its proper divisors (3666395).

18212605 is a wasteful number, since it uses less digits than its factorization.

18212605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3983.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 18212605 is about 4267.6228746224. The cubic root of 18212605 is about 263.1019233208.

Adding to 18212605 its reverse (50621281), we get a palindrome (68833886).

The spelling of 18212605 in words is "eighteen million, two hundred twelve thousand, six hundred five".