1979978 has 64 divisors (see below), whose sum is σ = 4257792. Its totient is φ = 665280.

The previous prime is 1979947. The next prime is 1979993. The reversal of 1979978 is 8799791.

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 46025 + ... + 46067.

It is an arithmetic number, because the mean of its divisors is an integer number (66528).

2^1979978 is an apocalyptic number.

1979978 is an abundant number, since it is smaller than the sum of its proper divisors (2277814).

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

1979978 is a wasteful number, since it uses less digits than its factorization.

1979978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99.

The product of its digits is 285768, while the sum is 50.

The square root of 1979978 is about 1407.1169105657. The cubic root of 1979978 is about 125.5702584859.

It can be divided in two parts, 19 and 79978, that added together give a palindrome (79997).

The spelling of 1979978 in words is "one million, nine hundred seventy-nine thousand, nine hundred seventy-eight".