18441405 has 16 divisors (see below), whose sum is σ = 32784960. Its totient is φ = 9835344.

The previous prime is 18441391. The next prime is 18441407. The reversal of 18441405 is 50414481.

It is a happy number.

It is not a de Polignac number, because 18441405 - 2⁶ = 18441341 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18441407) 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, 68167 + ... + 68436.

It is an arithmetic number, because the mean of its divisors is an integer number (2049060).

Almost surely, 2^18441405 is an apocalyptic number.

18441405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18441405 is a deficient number, since it is larger than the sum of its proper divisors (14343555).

18441405 is a wasteful number, since it uses less digits than its factorization.

18441405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136617 (or 136611 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 18441405 is about 4294.3457010353. The cubic root of 18441405 is about 264.1991008395.

Adding to 18441405 its reverse (50414481), we get a palindrome (68855886).

It can be divided in two parts, 1844 and 1405, that added together give a square (3249 = 57²).

The spelling of 18441405 in words is "eighteen million, four hundred forty-one thousand, four hundred five".