12081658 has 4 divisors (see below), whose sum is σ = 18122490. Its totient is φ = 6040828.

The previous prime is 12081653. The next prime is 12081659. The reversal of 12081658 is 85618021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11675889 + 405769 = 3417^2 + 637^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12081653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3020413 + ... + 3020416.

Almost surely, 2^12081658 is an apocalyptic number.

12081658 is a deficient number, since it is larger than the sum of its proper divisors (6040832).

12081658 is an equidigital number, since it uses as much as digits as its factorization.

12081658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040831.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 12081658 is about 3475.8679491603. The cubic root of 12081658 is about 229.4609809891.

Adding to 12081658 its reverse (85618021), we get a palindrome (97699679).

The spelling of 12081658 in words is "twelve million, eighty-one thousand, six hundred fifty-eight".