18424661 has 4 divisors (see below), whose sum is σ = 19394400. Its totient is φ = 17454924.

The previous prime is 18424639. The next prime is 18424663. The reversal of 18424661 is 16642481.

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 18424661 - 2²² = 14230357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18424663) 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, 484841 + ... + 484878.

It is an arithmetic number, because the mean of its divisors is an integer number (4848600).

Almost surely, 2^18424661 is an apocalyptic number.

It is an amenable number.

18424661 is a deficient number, since it is larger than the sum of its proper divisors (969739).

18424661 is an equidigital number, since it uses as much as digits as its factorization.

18424661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969738.

The product of its digits is 9216, while the sum is 32.

The square root of 18424661 is about 4292.3957180111. The cubic root of 18424661 is about 264.1191161659.

The spelling of 18424661 in words is "eighteen million, four hundred twenty-four thousand, six hundred sixty-one".