18394505 has 8 divisors (see below), whose sum is σ = 22105224. Its totient is φ = 14694400.

The previous prime is 18394499. The next prime is 18394507. The reversal of 18394505 is 50549381.

It can be written as a sum of positive squares in 4 ways, for example, as 2226064 + 16168441 = 1492^2 + 4021^2 .

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

It is not a de Polignac number, because 18394505 - 2¹⁰ = 18393481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18394507) 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, 1865 + ... + 6345.

It is an arithmetic number, because the mean of its divisors is an integer number (2763153).

Almost surely, 2^18394505 is an apocalyptic number.

It is an amenable number.

18394505 is a deficient number, since it is larger than the sum of its proper divisors (3710719).

18394505 is an equidigital number, since it uses as much as digits as its factorization.

18394505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5307.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 18394505 is about 4288.8815558371. The cubic root of 18394505 is about 263.9749411859.

The spelling of 18394505 in words is "eighteen million, three hundred ninety-four thousand, five hundred five".