Search a number
-
+
18664429 = 72991943
BaseRepresentation
bin100011100110…
…0101111101101
31022010020210011
41013030233231
514234230204
61504013221
7314434150
oct107145755
938106704
1018664429
11a598953
126301211
133b36554
14269bc97
15198a304
hex11ccbed

18664429 has 8 divisors (see below), whose sum is σ = 22066560. Its totient is φ = 15446256.

The previous prime is 18664417. The next prime is 18664433. The reversal of 18664429 is 92446681.

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

It is not a de Polignac number, because 18664429 - 29 = 18663917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18664391 and 18664400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18664229) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45769 + ... + 46174.

It is an arithmetic number, because the mean of its divisors is an integer number (2758320).

Almost surely, 218664429 is an apocalyptic number.

It is an amenable number.

18664429 is a deficient number, since it is larger than the sum of its proper divisors (3402131).

18664429 is an equidigital number, since it uses as much as digits as its factorization.

18664429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91979.

The product of its digits is 82944, while the sum is 40.

The square root of 18664429 is about 4320.2348315803. The cubic root of 18664429 is about 265.2598803366.

The spelling of 18664429 in words is "eighteen million, six hundred sixty-four thousand, four hundred twenty-nine".

Divisors: 1 7 29 203 91943 643601 2666347 18664429