9998390 has 16 divisors (see below), whose sum is σ = 18065808. Its totient is φ = 3984096.

The previous prime is 9998381. The next prime is 9998393. The reversal of 9998390 is 938999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998393) 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, 1064 + ... + 4596.

It is an arithmetic number, because the mean of its divisors is an integer number (1129113).

Almost surely, 2^9998390 is an apocalyptic number.

9998390 is a deficient number, since it is larger than the sum of its proper divisors (8067418).

9998390 is a wasteful number, since it uses less digits than its factorization.

9998390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3823.

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

The square root of 9998390 is about 3162.0230865697. The cubic root of 9998390 is about 215.4319062498.

It can be divided in two parts, 99 and 98390, that added together give a palindrome (98489).

The spelling of 9998390 in words is "nine million, nine hundred ninety-eight thousand, three hundred ninety".