9999638 has 16 divisors (see below), whose sum is σ = 17326224. Its totient is φ = 4277760.

The previous prime is 9999637. The next prime is 9999653. The reversal of 9999638 is 8369999.

It is a self number, because there is not a number n which added to its sum of digits gives 9999638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12995 + ... + 13742.

It is an arithmetic number, because the mean of its divisors is an integer number (1082889).

Almost surely, 2^9999638 is an apocalyptic number.

9999638 is a deficient number, since it is larger than the sum of its proper divisors (7326586).

9999638 is a wasteful number, since it uses less digits than its factorization.

9999638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26767.

The product of its digits is 944784, while the sum is 53.

The square root of 9999638 is about 3162.2204224247. The cubic root of 9999638 is about 215.4408692873.

The spelling of 9999638 in words is "nine million, nine hundred ninety-nine thousand, six hundred thirty-eight".