18023801 has 2 divisors, whose sum is σ = 18023802. Its totient is φ = 18023800.

The previous prime is 18023779. The next prime is 18023821. The reversal of 18023801 is 10832081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13697401 + 4326400 = 3701^2 + 2080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18023801 is a prime.

It is not a weakly prime, because it can be changed into another prime (18023821) 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 as a sum of consecutive naturals, namely, 9011900 + 9011901.

It is an arithmetic number, because the mean of its divisors is an integer number (9011901).

Almost surely, 2^18023801 is an apocalyptic number.

It is an amenable number.

18023801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18023801 is an equidigital number, since it uses as much as digits as its factorization.

18023801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 18023801 is about 4245.4447352427. Note that the first 3 decimals coincide. The cubic root of 18023801 is about 262.1896001490.

Adding to 18023801 its reverse (10832081), we get a palindrome (28855882).

The spelling of 18023801 in words is "eighteen million, twenty-three thousand, eight hundred one".