12591993 has 8 divisors (see below), whose sum is σ = 16809856. Its totient is φ = 8384400.

The previous prime is 12591977. The next prime is 12592001. The reversal of 12591993 is 39919521.

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

It is not a de Polignac number, because 12591993 - 2⁴ = 12591977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12591493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1008 + ... + 5118.

It is an arithmetic number, because the mean of its divisors is an integer number (2101232).

Almost surely, 2^12591993 is an apocalyptic number.

It is an amenable number.

12591993 is a deficient number, since it is larger than the sum of its proper divisors (4217863).

12591993 is a wasteful number, since it uses less digits than its factorization.

12591993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135.

The product of its digits is 21870, while the sum is 39.

The square root of 12591993 is about 3548.5198322681. The cubic root of 12591993 is about 232.6473756343.

The spelling of 12591993 in words is "twelve million, five hundred ninety-one thousand, nine hundred ninety-three".