9780998 has 4 divisors (see below), whose sum is σ = 14671500. Its totient is φ = 4890498.

The previous prime is 9780989. The next prime is 9781007. The reversal of 9780998 is 8990879.

9780998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8990879 = 541 ⋅16619.

It is an interprime number because it is at equal distance from previous prime (9780989) and next prime (9781007).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2445248 + ... + 2445251.

It is an arithmetic number, because the mean of its divisors is an integer number (3667875).

Almost surely, 2^9780998 is an apocalyptic number.

9780998 is a deficient number, since it is larger than the sum of its proper divisors (4890502).

9780998 is a wasteful number, since it uses less digits than its factorization.

9780998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4890501.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 9780998 is about 3127.4587127571. The cubic root of 9780998 is about 213.8590943625.

The spelling of 9780998 in words is "nine million, seven hundred eighty thousand, nine hundred ninety-eight".