18418901 has 4 divisors (see below), whose sum is σ = 18427500. Its totient is φ = 18410304.

The previous prime is 18418861. The next prime is 18418927. The reversal of 18418901 is 10981481.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8994001 + 9424900 = 2999^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 18418901 - 2¹⁸ = 18156757 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 (18418951) 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, 1775 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (4606875).

Almost surely, 2^18418901 is an apocalyptic number.

It is an amenable number.

18418901 is a deficient number, since it is larger than the sum of its proper divisors (8599).

18418901 is an equidigital number, since it uses as much as digits as its factorization.

18418901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8598.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 18418901 is about 4291.7247115816. The cubic root of 18418901 is about 264.0915899304.

The spelling of 18418901 in words is "eighteen million, four hundred eighteen thousand, nine hundred one".