18442405 has 8 divisors (see below), whose sum is σ = 22894200. Its totient is φ = 14245056.

The previous prime is 18442393. The next prime is 18442409. The reversal of 18442405 is 50424481.

It can be written as a sum of positive squares in 4 ways, for example, as 3969 + 18438436 = 63^2 + 4294^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18442405 - 2⁵ = 18442373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18442409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63450 + ... + 63739.

It is an arithmetic number, because the mean of its divisors is an integer number (2861775).

Almost surely, 2^18442405 is an apocalyptic number.

It is an amenable number.

18442405 is a deficient number, since it is larger than the sum of its proper divisors (4451795).

18442405 is a wasteful number, since it uses less digits than its factorization.

18442405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127223.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 18442405 is about 4294.4621316295. The cubic root of 18442405 is about 264.2038762226.

Adding to 18442405 its reverse (50424481), we get a palindrome (68866886).

The spelling of 18442405 in words is "eighteen million, four hundred forty-two thousand, four hundred five".