18471841 has 4 divisors (see below), whose sum is σ = 18490500. Its totient is φ = 18453184.

The previous prime is 18471821. The next prime is 18471863. The reversal of 18471841 is 14817481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14817481 = 7 ⋅2116783.

It can be written as a sum of positive squares in 2 ways, for example, as 15374241 + 3097600 = 3921^2 + 1760^2 .

It is a cyclic number.

It is not a de Polignac number, because 18471841 - 2¹⁷ = 18340769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18471797 and 18471806.

It is not an unprimeable number, because it can be changed into a prime (18471821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7756 + ... + 9853.

It is an arithmetic number, because the mean of its divisors is an integer number (4622625).

Almost surely, 2^18471841 is an apocalyptic number.

It is an amenable number.

18471841 is a deficient number, since it is larger than the sum of its proper divisors (18659).

18471841 is a wasteful number, since it uses less digits than its factorization.

18471841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18658.

The product of its digits is 7168, while the sum is 34.

The square root of 18471841 is about 4297.8879696893. The cubic root of 18471841 is about 264.3443671415.

The spelling of 18471841 in words is "eighteen million, four hundred seventy-one thousand, eight hundred forty-one".