12406815 has 24 divisors (see below), whose sum is σ = 21874320. Its totient is φ = 6503424.

The previous prime is 12406813. The next prime is 12406819. The reversal of 12406815 is 51860421.

It is not a de Polignac number, because 12406815 - 2¹ = 12406813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12406811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 319 + ... + 4991.

It is an arithmetic number, because the mean of its divisors is an integer number (911430).

Almost surely, 2^12406815 is an apocalyptic number.

12406815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12406815 is a deficient number, since it is larger than the sum of its proper divisors (9467505).

12406815 is a wasteful number, since it uses less digits than its factorization.

12406815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4743 (or 4740 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 12406815 is about 3522.3309043870. The cubic root of 12406815 is about 231.5013007094.

The spelling of 12406815 in words is "twelve million, four hundred six thousand, eight hundred fifteen".