12740385 has 32 divisors (see below), whose sum is σ = 23657472. Its totient is φ = 5734080.

The previous prime is 12740369. The next prime is 12740423. The reversal of 12740385 is 58304721.

It is not a de Polignac number, because 12740385 - 2⁴ = 12740369 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6130 + ... + 7940.

It is an arithmetic number, because the mean of its divisors is an integer number (739296).

Almost surely, 2^12740385 is an apocalyptic number.

12740385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12740385 is a deficient number, since it is larger than the sum of its proper divisors (10917087).

12740385 is a wasteful number, since it uses less digits than its factorization.

12740385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 12740385 is about 3569.3675910447. The cubic root of 12740385 is about 233.5576968907.

The spelling of 12740385 in words is "twelve million, seven hundred forty thousand, three hundred eighty-five".