12219405 has 32 divisors (see below), whose sum is σ = 21565440. Its totient is φ = 5858880.

The previous prime is 12219391. The next prime is 12219407. The reversal of 12219405 is 50491221.

12219405 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12219405 - 2¹⁴ = 12203021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12219407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16636 + ... + 17354.

It is an arithmetic number, because the mean of its divisors is an integer number (673920).

Almost surely, 2^12219405 is an apocalyptic number.

12219405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12219405 is a deficient number, since it is larger than the sum of its proper divisors (9346035).

12219405 is a wasteful number, since it uses less digits than its factorization.

12219405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 12219405 is about 3495.6265532805. The cubic root of 12219405 is about 230.3297412787.

The spelling of 12219405 in words is "twelve million, two hundred nineteen thousand, four hundred five".