12019887 has 16 divisors (see below), whose sum is σ = 19426560. Its totient is φ = 7284600.

The previous prime is 12019883. The next prime is 12019897. The reversal of 12019887 is 78891021.

It is not a de Polignac number, because 12019887 - 2² = 12019883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12019883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19939 + ... + 20532.

It is an arithmetic number, because the mean of its divisors is an integer number (1214160).

Almost surely, 2^12019887 is an apocalyptic number.

12019887 is a deficient number, since it is larger than the sum of its proper divisors (7406673).

12019887 is a wasteful number, since it uses less digits than its factorization.

12019887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40491 (or 40485 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 12019887 is about 3466.9708680634. The cubic root of 12019887 is about 229.0692505550.

The spelling of 12019887 in words is "twelve million, nineteen thousand, eight hundred eighty-seven".