18550401 has 8 divisors (see below), whose sum is σ = 25586880. Its totient is φ = 11940432.

The previous prime is 18550393. The next prime is 18550421. The reversal of 18550401 is 10405581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18550401 - 2³ = 18550393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18550421) 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, 106525 + ... + 106698.

It is an arithmetic number, because the mean of its divisors is an integer number (3198360).

Almost surely, 2^18550401 is an apocalyptic number.

It is an amenable number.

18550401 is a deficient number, since it is larger than the sum of its proper divisors (7036479).

18550401 is a wasteful number, since it uses less digits than its factorization.

18550401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213255.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 18550401 is about 4307.0176456569. The cubic root of 18550401 is about 264.7185857985.

Adding to 18550401 its reverse (10405581), we get a palindrome (28955982).

The spelling of 18550401 in words is "eighteen million, five hundred fifty thousand, four hundred one".