9998961 has 16 divisors (see below), whose sum is σ = 15295488. Its totient is φ = 5691600.

The previous prime is 9998929. The next prime is 9998969. The reversal of 9998961 is 1698999.

It is not a de Polignac number, because 9998961 - 2⁵ = 9998929 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5766 + ... + 7296.

It is an arithmetic number, because the mean of its divisors is an integer number (955968).

Almost surely, 2^9998961 is an apocalyptic number.

It is an amenable number.

9998961 is a deficient number, since it is larger than the sum of its proper divisors (5296527).

9998961 is a wasteful number, since it uses less digits than its factorization.

9998961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852.

The product of its digits is 314928, while the sum is 51.

The square root of 9998961 is about 3162.1133755765. The cubic root of 9998961 is about 215.4360072193.

The spelling of 9998961 in words is "nine million, nine hundred ninety-eight thousand, nine hundred sixty-one".