9902 has 4 divisors (see below), whose sum is σ = 14856. Its totient is φ = 4950.

The previous prime is 9901. The next prime is 9907. The reversal of 9902 is 2099.

9902 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 13 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2474 + ... + 2477.

It is an arithmetic number, because the mean of its divisors is an integer number (3714).

2⁹⁹⁰² is an apocalyptic number.

9902 is a deficient number, since it is larger than the sum of its proper divisors (4954).

9902 is a wasteful number, since it uses less digits than its factorization.

9902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4953.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 9902 is about 99.5087935813. The cubic root of 9902 is about 21.4737375384.

It can be divided in two parts, 9 and 902, that multiplied together give a palindrome (8118).

The spelling of 9902 in words is "nine thousand, nine hundred two".