9998655 has 16 divisors (see below), whose sum is σ = 16840320. Its totient is φ = 5051808.

The previous prime is 9998641. The next prime is 9998689. The reversal of 9998655 is 5568999.

9998655 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9998655 - 2⁵ = 9998623 is a prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9998598 and 9998607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17257 + ... + 17826.

It is an arithmetic number, because the mean of its divisors is an integer number (1052520).

Almost surely, 2^9998655 is an apocalyptic number.

9998655 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

9998655 is a deficient number, since it is larger than the sum of its proper divisors (6841665).

9998655 is a wasteful number, since it uses less digits than its factorization.

9998655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35110.

The product of its digits is 874800, while the sum is 51.

The square root of 9998655 is about 3162.0649898445. The cubic root of 9998655 is about 215.4338095212.

The spelling of 9998655 in words is "nine million, nine hundred ninety-eight thousand, six hundred fifty-five".