12705399 has 12 divisors (see below), whose sum is σ = 20974096. Its totient is φ = 7260192.

The previous prime is 12705397. The next prime is 12705401. The reversal of 12705399 is 99350721.

It is an interprime number because it is at equal distance from previous prime (12705397) and next prime (12705401).

It is not a de Polignac number, because 12705399 - 2¹ = 12705397 is a prime.

It is a super-2 number, since 2×12705399² = 322854327498402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12705397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100774 + ... + 100899.

Almost surely, 2^12705399 is an apocalyptic number.

12705399 is a deficient number, since it is larger than the sum of its proper divisors (8268697).

12705399 is a wasteful number, since it uses less digits than its factorization.

12705399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201686 (or 201683 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 12705399 is about 3564.4633537182. The cubic root of 12705399 is about 233.3437122367.

The spelling of 12705399 in words is "twelve million, seven hundred five thousand, three hundred ninety-nine".