18441861 has 4 divisors (see below), whose sum is σ = 24589152. Its totient is φ = 12294572.

The previous prime is 18441851. The next prime is 18441881. The reversal of 18441861 is 16814481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16814481 = 3 ⋅5604827.

It is a cyclic number.

It is not a de Polignac number, because 18441861 - 2⁷ = 18441733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18441811) 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 3 ways as a sum of consecutive naturals, for example, 3073641 + ... + 3073646.

It is an arithmetic number, because the mean of its divisors is an integer number (6147288).

Almost surely, 2^18441861 is an apocalyptic number.

It is an amenable number.

18441861 is a deficient number, since it is larger than the sum of its proper divisors (6147291).

18441861 is an equidigital number, since it uses as much as digits as its factorization.

18441861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6147290.

The product of its digits is 6144, while the sum is 33.

The square root of 18441861 is about 4294.3987937778. The cubic root of 18441861 is about 264.2012784356.

The spelling of 18441861 in words is "eighteen million, four hundred forty-one thousand, eight hundred sixty-one".