18258641 has 4 divisors (see below), whose sum is σ = 18291300. Its totient is φ = 18225984.

The previous prime is 18258637. The next prime is 18258683. The reversal of 18258641 is 14685281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1210000 + 17048641 = 1100^2 + 4129^2 .

It is a cyclic number.

It is not a de Polignac number, because 18258641 - 2² = 18258637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18258241) 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, 15476 + ... + 16613.

It is an arithmetic number, because the mean of its divisors is an integer number (4572825).

Almost surely, 2^18258641 is an apocalyptic number.

It is an amenable number.

18258641 is a deficient number, since it is larger than the sum of its proper divisors (32659).

18258641 is an equidigital number, since it uses as much as digits as its factorization.

18258641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32658.

The product of its digits is 15360, while the sum is 35.

The square root of 18258641 is about 4273.0131055264. The cubic root of 18258641 is about 263.3234177042.

The spelling of 18258641 in words is "eighteen million, two hundred fifty-eight thousand, six hundred forty-one".