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12218029 = 37330217
BaseRepresentation
bin101110100110…
…111010101101
3211222201222121
4232212322231
511111434104
61113512541
7205565035
oct56467255
924881877
1012218029
11699564a
124112751
1326ba305
1418a08c5
151115254
hexba6ead

12218029 has 4 divisors (see below), whose sum is σ = 12548284. Its totient is φ = 11887776.

The previous prime is 12218027. The next prime is 12218033. The reversal of 12218029 is 92081221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92081221 = 331278191.

It can be written as a sum of positive squares in 2 ways, for example, as 5978025 + 6240004 = 2445^2 + 2498^2 .

It is a cyclic number.

It is not a de Polignac number, because 12218029 - 21 = 12218027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12217994 and 12218012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218027) 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, 165072 + ... + 165145.

It is an arithmetic number, because the mean of its divisors is an integer number (3137071).

Almost surely, 212218029 is an apocalyptic number.

It is an amenable number.

12218029 is a deficient number, since it is larger than the sum of its proper divisors (330255).

12218029 is an equidigital number, since it uses as much as digits as its factorization.

12218029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330254.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12218029 is about 3495.4297303765. The cubic root of 12218029 is about 230.3210953143.

The spelling of 12218029 in words is "twelve million, two hundred eighteen thousand, twenty-nine".

Divisors: 1 37 330217 12218029