12161438 has 16 divisors (see below), whose sum is σ = 18918144. Its totient is φ = 5859480.

The previous prime is 12161437. The next prime is 12161447. The reversal of 12161438 is 83416121.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12161431) 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 7 ways as a sum of consecutive naturals, for example, 5333 + ... + 7263.

It is an arithmetic number, because the mean of its divisors is an integer number (1182384).

Almost surely, 2^12161438 is an apocalyptic number.

12161438 is a deficient number, since it is larger than the sum of its proper divisors (6756706).

12161438 is a wasteful number, since it uses less digits than its factorization.

12161438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2047.

The product of its digits is 1152, while the sum is 26.

The square root of 12161438 is about 3487.3253361280. The cubic root of 12161438 is about 229.9649473992.

Adding to 12161438 its reverse (83416121), we get a palindrome (95577559).

The spelling of 12161438 in words is "twelve million, one hundred sixty-one thousand, four hundred thirty-eight".