12840293 has 4 divisors (see below), whose sum is σ = 13254528. Its totient is φ = 12426060.

The previous prime is 12840283. The next prime is 12840299. The reversal of 12840293 is 39204821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39204821 = 307 ⋅127703.

It is a cyclic number.

It is not a de Polignac number, because 12840293 - 2¹⁶ = 12774757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12840299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207071 + ... + 207132.

It is an arithmetic number, because the mean of its divisors is an integer number (3313632).

Almost surely, 2^12840293 is an apocalyptic number.

It is an amenable number.

12840293 is a deficient number, since it is larger than the sum of its proper divisors (414235).

12840293 is an equidigital number, since it uses as much as digits as its factorization.

12840293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414234.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 12840293 is about 3583.3354573637. The cubic root of 12840293 is about 234.1666149674.

The spelling of 12840293 in words is "twelve million, eight hundred forty thousand, two hundred ninety-three".