18618741 has 20 divisors (see below), whose sum is σ = 28344492. Its totient is φ = 12175488.

The previous prime is 18618739. The next prime is 18618763. The reversal of 18618741 is 14781681.

It can be written as a sum of positive squares in 2 ways, for example, as 5267025 + 13351716 = 2295^2 + 3654^2 .

It is not a de Polignac number, because 18618741 - 2¹ = 18618739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18618696 and 18618705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18618731) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2125 + ... + 6461.

Almost surely, 2^18618741 is an apocalyptic number.

It is an amenable number.

18618741 is a deficient number, since it is larger than the sum of its proper divisors (9725751).

18618741 is an equidigital number, since it uses as much as digits as its factorization.

18618741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4402 (or 4393 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 18618741 is about 4314.9439162056. The cubic root of 18618741 is about 265.0432633768.

The spelling of 18618741 in words is "eighteen million, six hundred eighteen thousand, seven hundred forty-one".