12120638 has 4 divisors (see below), whose sum is σ = 18180960. Its totient is φ = 6060318.

The previous prime is 12120631. The next prime is 12120649. The reversal of 12120638 is 83602121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83602121 = 503 ⋅166207.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3030158 + ... + 3030161.

It is an arithmetic number, because the mean of its divisors is an integer number (4545240).

Almost surely, 2^12120638 is an apocalyptic number.

12120638 is a deficient number, since it is larger than the sum of its proper divisors (6060322).

12120638 is an equidigital number, since it uses as much as digits as its factorization.

12120638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6060321.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 12120638 is about 3481.4706662559. The cubic root of 12120638 is about 229.7074920479.

Adding to 12120638 its reverse (83602121), we get a palindrome (95722759).

The spelling of 12120638 in words is "twelve million, one hundred twenty thousand, six hundred thirty-eight".