18364405 has 4 divisors (see below), whose sum is σ = 22037292. Its totient is φ = 14691520.

The previous prime is 18364387. The next prime is 18364417. The reversal of 18364405 is 50446381.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4990756 + 13373649 = 2234^2 + 3657^2 .

It is not a de Polignac number, because 18364405 - 2⁷ = 18364277 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 3 ways as a sum of consecutive naturals, for example, 1836436 + ... + 1836445.

It is an arithmetic number, because the mean of its divisors is an integer number (5509323).

Almost surely, 2^18364405 is an apocalyptic number.

It is an amenable number.

18364405 is a deficient number, since it is larger than the sum of its proper divisors (3672887).

18364405 is an equidigital number, since it uses as much as digits as its factorization.

18364405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3672886.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 18364405 is about 4285.3710457789. The cubic root of 18364405 is about 263.8308767194.

It can be divided in two parts, 18364 and 405, that added together give a square (18769 = 137²).

The spelling of 18364405 in words is "eighteen million, three hundred sixty-four thousand, four hundred five".