9903998 has 16 divisors (see below), whose sum is σ = 16145136. Its totient is φ = 4529280.

The previous prime is 9903989. The next prime is 9904019. The reversal of 9903998 is 8993099.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1253 + ... + 4623.

It is an arithmetic number, because the mean of its divisors is an integer number (1009071).

Almost surely, 2^9903998 is an apocalyptic number.

9903998 is a deficient number, since it is larger than the sum of its proper divisors (6241138).

9903998 is a wasteful number, since it uses less digits than its factorization.

9903998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 9903998 is about 3147.0618042867. The cubic root of 9903998 is about 214.7518174638.

It can be divided in two parts, 9903 and 998, that added together give a palindrome (10901).

The spelling of 9903998 in words is "nine million, nine hundred three thousand, nine hundred ninety-eight".