18494141 has 4 divisors (see below), whose sum is σ = 19131900. Its totient is φ = 17856384.

The previous prime is 18494131. The next prime is 18494167. The reversal of 18494141 is 14149481.

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 3786916 + 14707225 = 1946^2 + 3835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18494141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18494098 and 18494107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18494131) 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, 318836 + ... + 318893.

It is an arithmetic number, because the mean of its divisors is an integer number (4782975).

Almost surely, 2^18494141 is an apocalyptic number.

It is an amenable number.

18494141 is a deficient number, since it is larger than the sum of its proper divisors (637759).

18494141 is an equidigital number, since it uses as much as digits as its factorization.

18494141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637758.

The product of its digits is 4608, while the sum is 32.

The square root of 18494141 is about 4300.4814846712. The cubic root of 18494141 is about 264.4507003217.

The spelling of 18494141 in words is "eighteen million, four hundred ninety-four thousand, one hundred forty-one".