9978950 has 24 divisors (see below), whose sum is σ = 18741360. Its totient is φ = 3952800.

The previous prime is 9978919. The next prime is 9978959. The reversal of 9978950 is 598799.

It is a junction number, because it is equal to n+sod(n) for n = 9978895 and 9978904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4535 + ... + 6365.

It is an arithmetic number, because the mean of its divisors is an integer number (780890).

Almost surely, 2^9978950 is an apocalyptic number.

9978950 is a deficient number, since it is larger than the sum of its proper divisors (8762410).

9978950 is a wasteful number, since it uses less digits than its factorization.

9978950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952 (or 1947 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 47.

The square root of 9978950 is about 3158.9476095687. The cubic root of 9978950 is about 215.2921933076.

The spelling of 9978950 in words is "nine million, nine hundred seventy-eight thousand, nine hundred fifty".