9900638 has 8 divisors (see below), whose sum is σ = 16201080. Its totient is φ = 4500280.

The previous prime is 9900623. The next prime is 9900641. The reversal of 9900638 is 8360099.

9900638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 9900598 and 9900607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224993 + ... + 225036.

It is an arithmetic number, because the mean of its divisors is an integer number (2025135).

Almost surely, 2^9900638 is an apocalyptic number.

9900638 is a deficient number, since it is larger than the sum of its proper divisors (6300442).

9900638 is a wasteful number, since it uses less digits than its factorization.

9900638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450042.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 9900638 is about 3146.5279277324. The cubic root of 9900638 is about 214.7275293692.

The spelling of 9900638 in words is "nine million, nine hundred thousand, six hundred thirty-eight".