18238001 has 2 divisors, whose sum is σ = 18238002. Its totient is φ = 18238000.

The previous prime is 18237997. The next prime is 18238007. The reversal of 18238001 is 10083281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10086976 + 8151025 = 3176^2 + 2855^2 .

It is a cyclic number.

It is not a de Polignac number, because 18238001 - 2² = 18237997 is a prime.

It is not a weakly prime, because it can be changed into another prime (18238007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9119000 + 9119001.

It is an arithmetic number, because the mean of its divisors is an integer number (9119001).

Almost surely, 2^18238001 is an apocalyptic number.

It is an amenable number.

18238001 is a deficient number, since it is larger than the sum of its proper divisors (1).

18238001 is an equidigital number, since it uses as much as digits as its factorization.

18238001 is an evil number, because the sum of its binary digits is even.

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

The square root of 18238001 is about 4270.5972650204. The cubic root of 18238001 is about 263.2241579514.

It can be divided in two parts, 182 and 38001, that added together give a palindrome (38183).

The spelling of 18238001 in words is "eighteen million, two hundred thirty-eight thousand, one".