999903213 has 12 divisors (see below), whose sum is σ = 1457087580. Its totient is φ = 660702336.

The previous prime is 999903167. The next prime is 999903217. The reversal of 999903213 is 312309999.

It can be written as a sum of positive squares in 2 ways, for example, as 435223044 + 564680169 = 20862^2 + 23763^2 .

It is not a de Polignac number, because 999903213 - 2¹⁴ = 999886829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999903217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 490578 + ... + 492611.

It is an arithmetic number, because the mean of its divisors is an integer number (121423965).

Almost surely, 2^999903213 is an apocalyptic number.

It is an amenable number.

999903213 is a deficient number, since it is larger than the sum of its proper divisors (457184367).

999903213 is a wasteful number, since it uses less digits than its factorization.

999903213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983308 (or 983305 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 999903213 is about 31621.2462278133. The cubic root of 999903213 is about 999.9677366258.

The spelling of 999903213 in words is "nine hundred ninety-nine million, nine hundred three thousand, two hundred thirteen".