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18444245 = 53688849
BaseRepresentation
bin100011001011…
…0111111010101
31021201001202012
41012112333111
514210203440
61455154005
7312526211
oct106267725
937631665
1018444245
11a458486
126215905
133a8a271
142641941
151944e65
hex1196fd5

18444245 has 4 divisors (see below), whose sum is σ = 22133100. Its totient is φ = 14755392.

The previous prime is 18444227. The next prime is 18444247. The reversal of 18444245 is 54244481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54244481 = 79686639.

It can be written as a sum of positive squares in 2 ways, for example, as 11336689 + 7107556 = 3367^2 + 2666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-18444245 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18444247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1844420 + ... + 1844429.

It is an arithmetic number, because the mean of its divisors is an integer number (5533275).

Almost surely, 218444245 is an apocalyptic number.

It is an amenable number.

18444245 is a deficient number, since it is larger than the sum of its proper divisors (3688855).

18444245 is an equidigital number, since it uses as much as digits as its factorization.

18444245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688854.

The product of its digits is 20480, while the sum is 32.

The square root of 18444245 is about 4294.6763556757. The cubic root of 18444245 is about 264.2126624767.

The spelling of 18444245 in words is "eighteen million, four hundred forty-four thousand, two hundred forty-five".

Divisors: 1 5 3688849 18444245