9998742 has 16 divisors (see below), whose sum is σ = 21535920. Its totient is φ = 3076512.

The previous prime is 9998741. The next prime is 9998743. The reversal of 9998742 is 2478999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9998741) and next prime (9998743).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9998691 and 9998700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998741) 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, 64017 + ... + 64172.

It is an arithmetic number, because the mean of its divisors is an integer number (1345995).

Almost surely, 2^9998742 is an apocalyptic number.

9998742 is an abundant number, since it is smaller than the sum of its proper divisors (11537178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9998742 is a wasteful number, since it uses less digits than its factorization.

9998742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128207.

The product of its digits is 326592, while the sum is 48.

The square root of 9998742 is about 3162.0787466475. The cubic root of 9998742 is about 215.4344343615.

The spelling of 9998742 in words is "nine million, nine hundred ninety-eight thousand, seven hundred forty-two".