12019805 has 8 divisors (see below), whose sum is σ = 16484352. Its totient is φ = 8242128.

The previous prime is 12019801. The next prime is 12019807. The reversal of 12019805 is 50891021.

It is a happy number.

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 12019805 - 2² = 12019801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12019801) 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, 171677 + ... + 171746.

It is an arithmetic number, because the mean of its divisors is an integer number (2060544).

Almost surely, 2^12019805 is an apocalyptic number.

It is an amenable number.

12019805 is a deficient number, since it is larger than the sum of its proper divisors (4464547).

12019805 is an equidigital number, since it uses as much as digits as its factorization.

12019805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343435.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 12019805 is about 3466.9590421578. The cubic root of 12019805 is about 229.0687296482.

The spelling of 12019805 in words is "twelve million, nineteen thousand, eight hundred five".