12090405 has 8 divisors (see below), whose sum is σ = 19344672. Its totient is φ = 6448208.

The previous prime is 12090343. The next prime is 12090409. The reversal of 12090405 is 50409021.

12090405 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 a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12090405 - 2¹⁰ = 12089381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12090409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402999 + ... + 403028.

It is an arithmetic number, because the mean of its divisors is an integer number (2418084).

Almost surely, 2^12090405 is an apocalyptic number.

12090405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12090405 is a deficient number, since it is larger than the sum of its proper divisors (7254267).

12090405 is an equidigital number, since it uses as much as digits as its factorization.

12090405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806035.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 12090405 is about 3477.1259683825. The cubic root of 12090405 is about 229.5163434519.

Adding to 12090405 its reverse (50409021), we get a palindrome (62499426).

It can be divided in two parts, 120 and 90405, that added together give a triangular number (90525 = T₄₂₅).

The spelling of 12090405 in words is "twelve million, ninety thousand, four hundred five".