12161638 has 8 divisors (see below), whose sum is σ = 18257832. Its totient is φ = 6075696.

The previous prime is 12161629. The next prime is 12161651. The reversal of 12161638 is 83616121.

12161638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2106 + ... + 5362.

It is an arithmetic number, because the mean of its divisors is an integer number (2282229).

Almost surely, 2^12161638 is an apocalyptic number.

12161638 is a deficient number, since it is larger than the sum of its proper divisors (6096194).

12161638 is a wasteful number, since it uses less digits than its factorization.

12161638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5126.

The product of its digits is 1728, while the sum is 28.

The square root of 12161638 is about 3487.3540112813. The cubic root of 12161638 is about 229.9662080159.

Adding to 12161638 its reverse (83616121), we get a palindrome (95777759).

The spelling of 12161638 in words is "twelve million, one hundred sixty-one thousand, six hundred thirty-eight".