18340401 has 4 divisors (see below), whose sum is σ = 24453872. Its totient is φ = 12226932.

The previous prime is 18340397. The next prime is 18340409. The reversal of 18340401 is 10404381.

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.

It is not a de Polignac number, because 18340401 - 2² = 18340397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18340409) 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 3 ways as a sum of consecutive naturals, for example, 3056731 + ... + 3056736.

It is an arithmetic number, because the mean of its divisors is an integer number (6113468).

Almost surely, 2^18340401 is an apocalyptic number.

It is an amenable number.

18340401 is a deficient number, since it is larger than the sum of its proper divisors (6113471).

18340401 is an equidigital number, since it uses as much as digits as its factorization.

18340401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6113470.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18340401 is about 4282.5694390167. The cubic root of 18340401 is about 263.7158760312.

Adding to 18340401 its reverse (10404381), we get a palindrome (28744782).

The spelling of 18340401 in words is "eighteen million, three hundred forty thousand, four hundred one".