12001999 has 2 divisors, whose sum is σ = 12002000. Its totient is φ = 12001998.

The previous prime is 12001993. The next prime is 12002059. The reversal of 12001999 is 99910021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12001999 - 2²¹ = 9904847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12001999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12001993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000999 + 6001000.

It is an arithmetic number, because the mean of its divisors is an integer number (6001000).

Almost surely, 2^12001999 is an apocalyptic number.

12001999 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001999 is an equidigital number, since it uses as much as digits as its factorization.

12001999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 12001999 is about 3464.3901339197. The cubic root of 12001999 is about 228.9555604924.

The spelling of 12001999 in words is "twelve million, one thousand, nine hundred ninety-nine".