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18342241 = 24737417
BaseRepresentation
bin100010111111…
…0000101100001
31021111212211021
41011332011201
514143422431
61453045441
7311622631
oct105760541
937455737
1018342241
11a398885
126186881
133a529c8
1426166c1
151924b11
hex117e161

18342241 has 4 divisors (see below), whose sum is σ = 18352132. Its totient is φ = 18332352.

The previous prime is 18342223. The next prime is 18342251. The reversal of 18342241 is 14224381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14326225 + 4016016 = 3785^2 + 2004^2 .

It is a 3-Lehmer number, since φ(18342241) divides (18342241-1)3.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-18342241 is a prime.

It is a deceptive number, since it divides R18342240.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18342251) 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, 1236 + ... + 6181.

It is an arithmetic number, because the mean of its divisors is an integer number (4588033).

Almost surely, 218342241 is an apocalyptic number.

18342241 is the 2473-rd octagonal number.

It is an amenable number.

18342241 is a deficient number, since it is larger than the sum of its proper divisors (9891).

18342241 is an equidigital number, since it uses as much as digits as its factorization.

18342241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9890.

The product of its digits is 1536, while the sum is 25.

The square root of 18342241 is about 4282.7842579331. The cubic root of 18342241 is about 263.7246948312.

It can be divided in two parts, 183 and 42241, that added together give a palindrome (42424).

The spelling of 18342241 in words is "eighteen million, three hundred forty-two thousand, two hundred forty-one".

Divisors: 1 2473 7417 18342241