9905216 has 14 divisors (see below), whose sum is σ = 19655790. Its totient is φ = 4952576.

The previous prime is 9905209. The next prime is 9905221. The reversal of 9905216 is 6125099.

It can be written as a sum of positive squares in only one way, i.e., 9634816 + 270400 = 3104^2 + 520^2 .

It is a super-2 number, since 2×9905216² = 196226608013312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77321 + ... + 77448.

It is an arithmetic number, because the mean of its divisors is an integer number (1403985).

Almost surely, 2^9905216 is an apocalyptic number.

It is an amenable number.

9905216 is a deficient number, since it is larger than the sum of its proper divisors (9750574).

9905216 is a wasteful number, since it uses less digits than its factorization.

9905216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154781 (or 154771 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 9905216 is about 3147.2553121728. The cubic root of 9905216 is about 214.7606205415.

The spelling of 9905216 in words is "nine million, nine hundred five thousand, two hundred sixteen".