9906388 has 6 divisors (see below), whose sum is σ = 17336186. Its totient is φ = 4953192.

The previous prime is 9906367. The next prime is 9906401. The reversal of 9906388 is 8836099.

It can be written as a sum of positive squares in only one way, i.e., 8398404 + 1507984 = 2898^2 + 1228^2 .

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, 1238295 + ... + 1238302.

Almost surely, 2^9906388 is an apocalyptic number.

It is an amenable number.

9906388 is a deficient number, since it is larger than the sum of its proper divisors (7429798).

9906388 is a wasteful number, since it uses less digits than its factorization.

9906388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476601 (or 2476599 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 9906388 is about 3147.4415006478. The cubic root of 9906388 is about 214.7690904736.

The spelling of 9906388 in words is "nine million, nine hundred six thousand, three hundred eighty-eight".