18242705 has 12 divisors (see below), whose sum is σ = 23705820. Its totient is φ = 13470912.

The previous prime is 18242701. The next prime is 18242713. The reversal of 18242705 is 50724281.

It can be written as a sum of positive squares in 6 ways, for example, as 3810304 + 14432401 = 1952^2 + 3799^2 .

It is not a de Polignac number, because 18242705 - 2² = 18242701 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18242701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9950 + ... + 11639.

It is an arithmetic number, because the mean of its divisors is an integer number (1975485).

Almost surely, 2^18242705 is an apocalyptic number.

It is an amenable number.

18242705 is a deficient number, since it is larger than the sum of its proper divisors (5463115).

18242705 is a wasteful number, since it uses less digits than its factorization.

18242705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21620 (or 21607 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 18242705 is about 4271.1479721499. The cubic root of 18242705 is about 263.2467865279.

Adding to 18242705 its reverse (50724281), we get a palindrome (68966986).

The spelling of 18242705 in words is "eighteen million, two hundred forty-two thousand, seven hundred five".