1999212403 has 2 divisors, whose sum is σ = 1999212404. Its totient is φ = 1999212402.

The previous prime is 1999212401. The next prime is 1999212419. The reversal of 1999212403 is 3042129991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1999212403 - 2¹ = 1999212401 is a prime.

Together with 1999212401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1999212401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999606201 + 999606202.

It is an arithmetic number, because the mean of its divisors is an integer number (999606202).

Almost surely, 2^1999212403 is an apocalyptic number.

1999212403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999212403 is an equidigital number, since it uses as much as digits as its factorization.

1999212403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 1999212403 is about 44712.5530807625. The cubic root of 1999212403 is about 1259.7556431741.

The spelling of 1999212403 in words is "one billion, nine hundred ninety-nine million, two hundred twelve thousand, four hundred three".