18538801 has 4 divisors (see below), whose sum is σ = 19178100. Its totient is φ = 17899504.

The previous prime is 18538799. The next prime is 18538811. The reversal of 18538801 is 10883581.

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 9394225 + 9144576 = 3065^2 + 3024^2 .

It is a cyclic number.

It is not a de Polignac number, because 18538801 - 2¹ = 18538799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18538811) 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, 319606 + ... + 319663.

It is an arithmetic number, because the mean of its divisors is an integer number (4794525).

Almost surely, 2^18538801 is an apocalyptic number.

It is an amenable number.

18538801 is a deficient number, since it is larger than the sum of its proper divisors (639299).

18538801 is an equidigital number, since it uses as much as digits as its factorization.

18538801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639298.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 18538801 is about 4305.6707955904. The cubic root of 18538801 is about 264.6633960502.

The spelling of 18538801 in words is "eighteen million, five hundred thirty-eight thousand, eight hundred one".