12081393 has 10 divisors (see below), whose sum is σ = 18047634. Its totient is φ = 8054208.

The previous prime is 12081389. The next prime is 12081401. The reversal of 12081393 is 39318021.

12081393 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7683984 + 4397409 = 2772^2 + 2097^2 .

It is not a de Polignac number, because 12081393 - 2² = 12081389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12081343) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 74496 + ... + 74657.

Almost surely, 2^12081393 is an apocalyptic number.

It is an amenable number.

12081393 is a deficient number, since it is larger than the sum of its proper divisors (5966241).

12081393 is an equidigital number, since it uses as much as digits as its factorization.

12081393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149165 (or 149156 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 12081393 is about 3475.8298289761. The cubic root of 12081393 is about 229.4593033054.

It can be divided in two parts, 1208 and 1393, that added together give a square (2601 = 51²).

The spelling of 12081393 in words is "twelve million, eighty-one thousand, three hundred ninety-three".