12031993 has 4 divisors (see below), whose sum is σ = 12357220. Its totient is φ = 11706768.

The previous prime is 12031991. The next prime is 12032011. The reversal of 12031993 is 39913021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11580409 + 451584 = 3403^2 + 672^2 .

It is a cyclic number.

It is not a de Polignac number, because 12031993 - 2¹ = 12031991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12031991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162558 + ... + 162631.

It is an arithmetic number, because the mean of its divisors is an integer number (3089305).

Almost surely, 2^12031993 is an apocalyptic number.

It is an amenable number.

12031993 is a deficient number, since it is larger than the sum of its proper divisors (325227).

12031993 is an equidigital number, since it uses as much as digits as its factorization.

12031993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325226.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 12031993 is about 3468.7163331700. The cubic root of 12031993 is about 229.1461282016.

Subtracting from 12031993 its sum of digits (28), we obtain a triangular number (12031965 = T₄₉₀₅).

The spelling of 12031993 in words is "twelve million, thirty-one thousand, nine hundred ninety-three".