12906405 has 16 divisors (see below), whose sum is σ = 22944960. Its totient is φ = 6883344.

The previous prime is 12906403. The next prime is 12906419. The reversal of 12906405 is 50460921.

12906405 is a `hidden beast` number, since 12 + 9 + 0 + 640 + 5 = 666.

It is not a de Polignac number, because 12906405 - 2¹ = 12906403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12906403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47667 + ... + 47936.

It is an arithmetic number, because the mean of its divisors is an integer number (1434060).

Almost surely, 2^12906405 is an apocalyptic number.

12906405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12906405 is a deficient number, since it is larger than the sum of its proper divisors (10038555).

12906405 is an equidigital number, since it uses as much as digits as its factorization.

12906405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95617 (or 95611 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 12906405 is about 3592.5485382942. The cubic root of 12906405 is about 234.5678189255.

The spelling of 12906405 in words is "twelve million, nine hundred six thousand, four hundred five".