18227705 has 8 divisors (see below), whose sum is σ = 21899400. Its totient is φ = 14564736.

The previous prime is 18227701. The next prime is 18227711. The reversal of 18227705 is 50772281.

It can be written as a sum of positive squares in 4 ways, for example, as 11881 + 18215824 = 109^2 + 4268^2 .

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 18227705 - 2² = 18227701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18227701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4031 + ... + 7259.

It is an arithmetic number, because the mean of its divisors is an integer number (2737425).

Almost surely, 2^18227705 is an apocalyptic number.

It is an amenable number.

18227705 is a deficient number, since it is larger than the sum of its proper divisors (3671695).

18227705 is a wasteful number, since it uses less digits than its factorization.

18227705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 18227705 is about 4269.3916428456. The cubic root of 18227705 is about 263.1746154955.

Adding to 18227705 its reverse (50772281), we get a palindrome (68999986).

The spelling of 18227705 in words is "eighteen million, two hundred twenty-seven thousand, seven hundred five".