12905399 has 4 divisors (see below), whose sum is σ = 13898136. Its totient is φ = 11912664.

The previous prime is 12905381. The next prime is 12905407. The reversal of 12905399 is 99350921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99350921 = 563 ⋅176467.

It is a cyclic number.

It is not a de Polignac number, because 12905399 - 2¹⁶ = 12839863 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 (12905699) 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, 496349 + ... + 496374.

It is an arithmetic number, because the mean of its divisors is an integer number (3474534).

Almost surely, 2^12905399 is an apocalyptic number.

12905399 is a deficient number, since it is larger than the sum of its proper divisors (992737).

12905399 is an equidigital number, since it uses as much as digits as its factorization.

12905399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992736.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 12905399 is about 3592.4085235396. The cubic root of 12905399 is about 234.5617242421.

The spelling of 12905399 in words is "twelve million, nine hundred five thousand, three hundred ninety-nine".