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12213666 = 2368377
BaseRepresentation
bin101110100101…
…110110100010
3211222112000000
4232211312202
511111314131
61113440430
7205546233
oct56456642
924875000
1012213666
116992343
124110116
1326b832a
14189d08a
151113ce6
hexba5da2

12213666 has 28 divisors (see below), whose sum is σ = 27471462. Its totient is φ = 4070736.

The previous prime is 12213661. The next prime is 12213673. The reversal of 12213666 is 66631221.

It can be written as a sum of positive squares in only one way, i.e., 11758041 + 455625 = 3429^2 + 675^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (12213661) 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 13 ways as a sum of consecutive naturals, for example, 2731 + ... + 5646.

Almost surely, 212213666 is an apocalyptic number.

12213666 is an abundant number, since it is smaller than the sum of its proper divisors (15257796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12213666 is an frugal number, since it uses more digits than its factorization.

12213666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8397 (or 8382 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 12213666 is about 3494.8055739912. The cubic root of 12213666 is about 230.2936765280.

Adding to 12213666 its reverse (66631221), we get a palindrome (78844887).

The spelling of 12213666 in words is "twelve million, two hundred thirteen thousand, six hundred sixty-six".

Divisors: 1 2 3 6 9 18 27 54 81 162 243 486 729 1458 8377 16754 25131 50262 75393 150786 226179 452358 678537 1357074 2035611 4071222 6106833 12213666