18606641 has 4 divisors (see below), whose sum is σ = 18787392. Its totient is φ = 18425892.

The previous prime is 18606631. The next prime is 18606649. The reversal of 18606641 is 14660681.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 18606641 - 2¹⁸ = 18344497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18606598 and 18606607.

It is not an unprimeable number, because it can be changed into a prime (18606649) 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, 90221 + ... + 90426.

It is an arithmetic number, because the mean of its divisors is an integer number (4696848).

Almost surely, 2^18606641 is an apocalyptic number.

It is an amenable number.

18606641 is a deficient number, since it is larger than the sum of its proper divisors (180751).

18606641 is a wasteful number, since it uses less digits than its factorization.

18606641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180750.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 18606641 is about 4313.5415843597. The cubic root of 18606641 is about 264.9858352462.

The spelling of 18606641 in words is "eighteen million, six hundred six thousand, six hundred forty-one".