9902838 has 64 divisors (see below), whose sum is σ = 23328000. Its totient is φ = 2770560.

The previous prime is 9902831. The next prime is 9902839. The reversal of 9902838 is 8382099.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9902796 and 9902805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9902831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66388 + ... + 66536.

It is an arithmetic number, because the mean of its divisors is an integer number (364500).

Almost surely, 2^9902838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9902838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11664000).

9902838 is an abundant number, since it is smaller than the sum of its proper divisors (13425162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9902838 is a wasteful number, since it uses less digits than its factorization.

9902838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 9902838 is about 3146.8774999990. The cubic root of 9902838 is about 214.7434329092.

It can be divided in two parts, 990 and 2838, that added together give a triangular number (3828 = T₈₇).

The spelling of 9902838 in words is "nine million, nine hundred two thousand, eight hundred thirty-eight".