12195990 has 24 divisors (see below), whose sum is σ = 31709808. Its totient is φ = 3252240.

The previous prime is 12195973. The next prime is 12195991. The reversal of 12195990 is 9959121.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12195991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67666 + ... + 67845.

It is an arithmetic number, because the mean of its divisors is an integer number (1321242).

Almost surely, 2^12195990 is an apocalyptic number.

12195990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12195990 is an abundant number, since it is smaller than the sum of its proper divisors (19513818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12195990 is a wasteful number, since it uses less digits than its factorization.

12195990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135524 (or 135521 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 12195990 is about 3492.2757623074. The cubic root of 12195990 is about 230.1825268170.

The spelling of 12195990 in words is "twelve million, one hundred ninety-five thousand, nine hundred ninety".