1205978 has 16 divisors (see below), whose sum is σ = 1906080. Its totient is φ = 571536.

The previous prime is 1205977. The next prime is 1205999. The reversal of 1205978 is 8795021.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1205977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2993 + ... + 3371.

It is an arithmetic number, because the mean of its divisors is an integer number (119130).

2^1205978 is an apocalyptic number.

1205978 is a deficient number, since it is larger than the sum of its proper divisors (700102).

1205978 is a wasteful number, since it uses less digits than its factorization.

1205978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1205978 is about 1098.1702964477. The cubic root of 1205978 is about 106.4420250634.

The spelling of 1205978 in words is "one million, two hundred five thousand, nine hundred seventy-eight".