9978956 has 12 divisors (see below), whose sum is σ = 18806592. Its totient is φ = 4605648.

The previous prime is 9978919. The next prime is 9978959. The reversal of 9978956 is 6598799.

It is a junction number, because it is equal to n+sod(n) for n = 9978898 and 9978907.

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 3 ways as a sum of consecutive naturals, for example, 95900 + ... + 96003.

It is an arithmetic number, because the mean of its divisors is an integer number (1567216).

Almost surely, 2^9978956 is an apocalyptic number.

It is an amenable number.

9978956 is a deficient number, since it is larger than the sum of its proper divisors (8827636).

9978956 is a wasteful number, since it uses less digits than its factorization.

9978956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191920 (or 191918 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 53.

The square root of 9978956 is about 3158.9485592520. The cubic root of 9978956 is about 215.2922364569.

The spelling of 9978956 in words is "nine million, nine hundred seventy-eight thousand, nine hundred fifty-six".