8187978 has 8 divisors (see below), whose sum is σ = 16375968. Its totient is φ = 2729324.

The previous prime is 8187953. The next prime is 8187983. The reversal of 8187978 is 8797818.

It is a sphenic number, since it is the product of 3 distinct primes.

8187978 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 682326 + ... + 682337.

It is an arithmetic number, because the mean of its divisors is an integer number (2046996).

Almost surely, 2^8187978 is an apocalyptic number.

8187978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

8187978 is a wasteful number, since it uses less digits than its factorization.

8187978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364668.

The product of its digits is 225792, while the sum is 48.

The square root of 8187978 is about 2861.4643104537. The cubic root of 8187978 is about 201.5543716811.

The spelling of 8187978 in words is "eight million, one hundred eighty-seven thousand, nine hundred seventy-eight".