12001890 has 32 divisors (see below), whose sum is σ = 28946880. Its totient is φ = 3184704.

The previous prime is 12001877. The next prime is 12001897. The reversal of 12001890 is 9810021.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12001897) 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 15 ways as a sum of consecutive naturals, for example, 5997 + ... + 7743.

It is an arithmetic number, because the mean of its divisors is an integer number (904590).

Almost surely, 2^12001890 is an apocalyptic number.

12001890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12001890 is an abundant number, since it is smaller than the sum of its proper divisors (16944990).

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

12001890 is a wasteful number, since it uses less digits than its factorization.

12001890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 12001890 is about 3464.3744023994. The cubic root of 12001890 is about 228.9548673792.

The spelling of 12001890 in words is "twelve million, one thousand, eight hundred ninety".