9905212 has 6 divisors (see below), whose sum is σ = 17334128. Its totient is φ = 4952604.

The previous prime is 9905209. The next prime is 9905221. The reversal of 9905212 is 2125099.

It is a super-2 number, since 2×9905212² = 196226449529888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1238148 + ... + 1238155.

Almost surely, 2^9905212 is an apocalyptic number.

It is an amenable number.

9905212 is a deficient number, since it is larger than the sum of its proper divisors (7428916).

9905212 is a wasteful number, since it uses less digits than its factorization.

9905212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476307 (or 2476305 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 9905212 is about 3147.2546766984. The cubic root of 9905212 is about 214.7605916327.

The spelling of 9905212 in words is "nine million, nine hundred five thousand, two hundred twelve".