8211978 has 24 divisors (see below), whose sum is σ = 17847648. Its totient is φ = 2728872.

The previous prime is 8211977. The next prime is 8211991. The reversal of 8211978 is 8791128.

8211978 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (8211977) 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, 8601 + ... + 9507.

It is an arithmetic number, because the mean of its divisors is an integer number (743652).

Almost surely, 2^8211978 is an apocalyptic number.

8211978 is an abundant number, since it is smaller than the sum of its proper divisors (9635670).

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

8211978 is a wasteful number, since it uses less digits than its factorization.

8211978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418 (or 1415 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 8211978 is about 2865.6548989716. The cubic root of 8211978 is about 201.7511067135.

The spelling of 8211978 in words is "eight million, two hundred eleven thousand, nine hundred seventy-eight".