18441749 has 4 divisors (see below), whose sum is σ = 18507660. Its totient is φ = 18375840.

The previous prime is 18441743. The next prime is 18441751. The reversal of 18441749 is 94714481.

18441749 = 103² + 104² + ... + 383².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94714481 = 6917 ⋅13693.

It can be written as a sum of positive squares in 2 ways, for example, as 10562500 + 7879249 = 3250^2 + 2807^2 .

It is a cyclic number.

It is not a de Polignac number, because 18441749 - 2⁴ = 18441733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18441743) 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, 32534 + ... + 33095.

It is an arithmetic number, because the mean of its divisors is an integer number (4626915).

Almost surely, 2^18441749 is an apocalyptic number.

It is an amenable number.

18441749 is a deficient number, since it is larger than the sum of its proper divisors (65911).

18441749 is an equidigital number, since it uses as much as digits as its factorization.

18441749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65910.

The product of its digits is 32256, while the sum is 38.

The square root of 18441749 is about 4294.3857535159. The cubic root of 18441749 is about 264.2007435908.

The spelling of 18441749 in words is "eighteen million, four hundred forty-one thousand, seven hundred forty-nine".