1005978 has 8 divisors (see below), whose sum is σ = 2011968. Its totient is φ = 335324.

The previous prime is 1005971. The next prime is 1005989. The reversal of 1005978 is 8795001.

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

1005978 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1005971) 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, 83826 + ... + 83837.

It is an arithmetic number, because the mean of its divisors is an integer number (251496).

2^1005978 is an apocalyptic number.

1005978 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.

1005978 is a wasteful number, since it uses less digits than its factorization.

1005978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167668.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 1005978 is about 1002.9845462419. The cubic root of 1005978 is about 100.1988709081.

The spelling of 1005978 in words is "one million, five thousand, nine hundred seventy-eight".