18240411 has 16 divisors (see below), whose sum is σ = 27857664. Its totient is φ = 10399584.

The previous prime is 18240407. The next prime is 18240413. The reversal of 18240411 is 11404281.

It is a happy number.

It is not a de Polignac number, because 18240411 - 2² = 18240407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (18240413) 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, 13576 + ... + 14858.

It is an arithmetic number, because the mean of its divisors is an integer number (1741104).

Almost surely, 2^18240411 is an apocalyptic number.

18240411 is a deficient number, since it is larger than the sum of its proper divisors (9617253).

18240411 is a wasteful number, since it uses less digits than its factorization.

18240411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1970.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 18240411 is about 4270.8794176375. The cubic root of 18240411 is about 263.2357517345.

Adding to 18240411 its reverse (11404281), we get a palindrome (29644692).

The spelling of 18240411 in words is "eighteen million, two hundred forty thousand, four hundred eleven".