12205690 has 16 divisors (see below), whose sum is σ = 25108992. Its totient is φ = 4184784.

The previous prime is 12205649. The next prime is 12205691. The reversal of 12205690 is 9650221.

It is a super-2 number, since 2×12205690² = 297957736752200, which contains 22 as substring.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12205691) 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, 87114 + ... + 87253.

It is an arithmetic number, because the mean of its divisors is an integer number (1569312).

Almost surely, 2^12205690 is an apocalyptic number.

12205690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12205690 is an abundant number, since it is smaller than the sum of its proper divisors (12903302).

12205690 is a wasteful number, since it uses less digits than its factorization.

12205690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174381.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 12205690 is about 3493.6642654955. The cubic root of 12205690 is about 230.2435353624.

The spelling of 12205690 in words is "twelve million, two hundred five thousand, six hundred ninety".