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18041213 = 118715199
BaseRepresentation
bin100010011010…
…0100101111101
31020221120220002
41010310211331
514104304323
61442404045
7306230201
oct104644575
936846802
1018041213
11a2026a3
126060625
133978998
142578b01
1518b5828
hex113497d

18041213 has 4 divisors (see below), whose sum is σ = 18057600. Its totient is φ = 18024828.

The previous prime is 18041173. The next prime is 18041249. The reversal of 18041213 is 31214081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18041213 - 222 = 13846909 is a prime.

It is a super-2 number, since 2×180412132 = 650970733022738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18041263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6413 + ... + 8786.

It is an arithmetic number, because the mean of its divisors is an integer number (4514400).

Almost surely, 218041213 is an apocalyptic number.

It is an amenable number.

18041213 is a deficient number, since it is larger than the sum of its proper divisors (16387).

18041213 is a wasteful number, since it uses less digits than its factorization.

18041213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16386.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18041213 is about 4247.4949087668. The cubic root of 18041213 is about 262.2740029157.

Adding to 18041213 its reverse (31214081), we get a palindrome (49255294).

The spelling of 18041213 in words is "eighteen million, forty-one thousand, two hundred thirteen".

Divisors: 1 1187 15199 18041213