18205401 has 16 divisors (see below), whose sum is σ = 26378240. Its totient is φ = 11126160.

The previous prime is 18205399. The next prime is 18205423. The reversal of 18205401 is 10450281.

It is not a de Polignac number, because 18205401 - 2¹ = 18205399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18205001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3385 + ... + 6918.

It is an arithmetic number, because the mean of its divisors is an integer number (1648640).

Almost surely, 2^18205401 is an apocalyptic number.

It is an amenable number.

18205401 is a deficient number, since it is larger than the sum of its proper divisors (8172839).

18205401 is a wasteful number, since it uses less digits than its factorization.

18205401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10356.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 18205401 is about 4266.7787615483. The cubic root of 18205401 is about 263.0672287376.

Adding to 18205401 its reverse (10450281), we get a palindrome (28655682).

The spelling of 18205401 in words is "eighteen million, two hundred five thousand, four hundred one".