12019863 has 4 divisors (see below), whose sum is σ = 16026488. Its totient is φ = 8013240.

The previous prime is 12019849. The next prime is 12019871. The reversal of 12019863 is 36891021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12019863 - 2¹⁸ = 11757719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12019863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12019873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2003308 + ... + 2003313.

It is an arithmetic number, because the mean of its divisors is an integer number (4006622).

Almost surely, 2^12019863 is an apocalyptic number.

12019863 is a deficient number, since it is larger than the sum of its proper divisors (4006625).

12019863 is an equidigital number, since it uses as much as digits as its factorization.

12019863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006624.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 12019863 is about 3466.9674068269. The cubic root of 12019863 is about 229.0690980947.

The spelling of 12019863 in words is "twelve million, nineteen thousand, eight hundred sixty-three".