12045990 has 64 divisors (see below), whose sum is σ = 31871232. Its totient is φ = 2889600.

The previous prime is 12045973. The next prime is 12046003. The reversal of 12045990 is 9954021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56985 + ... + 57195.

It is an arithmetic number, because the mean of its divisors is an integer number (497988).

Almost surely, 2^12045990 is an apocalyptic number.

12045990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12045990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15935616).

12045990 is an abundant number, since it is smaller than the sum of its proper divisors (19825242).

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

12045990 is a wasteful number, since it uses less digits than its factorization.

12045990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 12045990 is about 3470.7333519013. The cubic root of 12045990 is about 229.2349501570.

The spelling of 12045990 in words is "twelve million, forty-five thousand, nine hundred ninety".