18290705 has 4 divisors (see below), whose sum is σ = 21948852. Its totient is φ = 14632560.

The previous prime is 18290689. The next prime is 18290707. The reversal of 18290705 is 50709281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50709281 = 7 ⋅7244183.

It can be written as a sum of positive squares in 2 ways, for example, as 3972049 + 14318656 = 1993^2 + 3784^2 .

It is not a de Polignac number, because 18290705 - 2⁴ = 18290689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18290707) 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, 1829066 + ... + 1829075.

It is an arithmetic number, because the mean of its divisors is an integer number (5487213).

Almost surely, 2^18290705 is an apocalyptic number.

It is an amenable number.

18290705 is a deficient number, since it is larger than the sum of its proper divisors (3658147).

18290705 is an equidigital number, since it uses as much as digits as its factorization.

18290705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658146.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 18290705 is about 4276.7633790052. The cubic root of 18290705 is about 263.4774683172.

Adding to 18290705 its reverse (50709281), we get a palindrome (68999986).

The spelling of 18290705 in words is "eighteen million, two hundred ninety thousand, seven hundred five".