18041405 has 8 divisors (see below), whose sum is σ = 21672792. Its totient is φ = 14417728.

The previous prime is 18041383. The next prime is 18041449. The reversal of 18041405 is 50414081.

It can be written as a sum of positive squares in 4 ways, for example, as 4813636 + 13227769 = 2194^2 + 3637^2 .

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 18041405 - 2¹⁸ = 17779261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6947 + ... + 9183.

It is an arithmetic number, because the mean of its divisors is an integer number (2709099).

Almost surely, 2^18041405 is an apocalyptic number.

It is an amenable number.

18041405 is a deficient number, since it is larger than the sum of its proper divisors (3631387).

18041405 is a wasteful number, since it uses less digits than its factorization.

18041405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855.

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

The square root of 18041405 is about 4247.5175102641. The cubic root of 18041405 is about 262.2749333119.

Adding to 18041405 its reverse (50414081), we get a palindrome (68455486).

It can be divided in two parts, 180 and 41405, that multiplied together give a square (7452900 = 2730²).

The spelling of 18041405 in words is "eighteen million, forty-one thousand, four hundred five".