12261142 has 16 divisors (see below), whose sum is σ = 19148400. Its totient is φ = 5881120.

The previous prime is 12261133. The next prime is 12261157. The reversal of 12261142 is 24116221.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9792 + ... + 10972.

It is an arithmetic number, because the mean of its divisors is an integer number (1196775).

Almost surely, 2^12261142 is an apocalyptic number.

12261142 is a deficient number, since it is larger than the sum of its proper divisors (6887258).

12261142 is a wasteful number, since it uses less digits than its factorization.

12261142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391.

The product of its digits is 192, while the sum is 19.

The square root of 12261142 is about 3501.5913525139. The cubic root of 12261142 is about 230.5916838745.

Adding to 12261142 its reverse (24116221), we get a palindrome (36377363).

It can be divided in two parts, 12261 and 142, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 12261142 in words is "twelve million, two hundred sixty-one thousand, one hundred forty-two".