9801978 has 16 divisors (see below), whose sum is σ = 19634880. Its totient is φ = 3262176.

The previous prime is 9801977. The next prime is 9801989. The reversal of 9801978 is 8791089.

9801978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9801973) 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, 6051 + ... + 7497.

It is an arithmetic number, because the mean of its divisors is an integer number (1227180).

Almost surely, 2^9801978 is an apocalyptic number.

9801978 is an abundant number, since it is smaller than the sum of its proper divisors (9832902).

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

9801978 is a wasteful number, since it uses less digits than its factorization.

9801978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 9801978 is about 3130.8110770214. The cubic root of 9801978 is about 214.0118926631.

The spelling of 9801978 in words is "nine million, eight hundred one thousand, nine hundred seventy-eight".