18402201 has 8 divisors (see below), whose sum is σ = 27262560. Its totient is φ = 12268116.

The previous prime is 18402199. The next prime is 18402217. The reversal of 18402201 is 10220481.

It is not a de Polignac number, because 18402201 - 2¹ = 18402199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18402271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340755 + ... + 340808.

It is an arithmetic number, because the mean of its divisors is an integer number (3407820).

Almost surely, 2^18402201 is an apocalyptic number.

It is an amenable number.

18402201 is a deficient number, since it is larger than the sum of its proper divisors (8860359).

18402201 is an equidigital number, since it uses as much as digits as its factorization.

18402201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681572 (or 681566 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 18402201 is about 4289.7786656190. The cubic root of 18402201 is about 264.0117505100.

Adding to 18402201 its reverse (10220481), we get a palindrome (28622682).

The spelling of 18402201 in words is "eighteen million, four hundred two thousand, two hundred one".