18450401 has 4 divisors (see below), whose sum is σ = 18470832. Its totient is φ = 18429972.

The previous prime is 18450379. The next prime is 18450427. The reversal of 18450401 is 10405481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10405481 = 97 ⋅107273.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18450401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18450001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8795 + ... + 10688.

It is an arithmetic number, because the mean of its divisors is an integer number (4617708).

Almost surely, 2^18450401 is an apocalyptic number.

It is an amenable number.

18450401 is a deficient number, since it is larger than the sum of its proper divisors (20431).

18450401 is an equidigital number, since it uses as much as digits as its factorization.

18450401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20430.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 18450401 is about 4295.3929971540. The cubic root of 18450401 is about 264.2420539794.

Adding to 18450401 its reverse (10405481), we get a palindrome (28855882).

The spelling of 18450401 in words is "eighteen million, four hundred fifty thousand, four hundred one".