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12215142 = 2321016719
BaseRepresentation
bin101110100110…
…001101100110
3211222121000200
4232212031212
511111341032
61113451330
7205553442
oct56461546
924877020
1012215142
116993465
124110b46
1326b8bc4
14189d822
15111447c
hexba6366

12215142 has 24 divisors (see below), whose sum is σ = 26732160. Its totient is φ = 4030800.

The previous prime is 12215141. The next prime is 12215149. The reversal of 12215142 is 24151221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215141) 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 11 ways as a sum of consecutive naturals, for example, 1542 + ... + 5177.

It is an arithmetic number, because the mean of its divisors is an integer number (1113840).

Almost surely, 212215142 is an apocalyptic number.

12215142 is an abundant number, since it is smaller than the sum of its proper divisors (14517018).

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

12215142 is a wasteful number, since it uses less digits than its factorization.

12215142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6828 (or 6825 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 12215142 is about 3495.0167381573. The cubic root of 12215142 is about 230.3029530159.

Adding to 12215142 its reverse (24151221), we get a palindrome (36366363).

The spelling of 12215142 in words is "twelve million, two hundred fifteen thousand, one hundred forty-two".

Divisors: 1 2 3 6 9 18 101 202 303 606 909 1818 6719 13438 20157 40314 60471 120942 678619 1357238 2035857 4071714 6107571 12215142