1979980 has 12 divisors (see below), whose sum is σ = 4158000. Its totient is φ = 791984.

The previous prime is 1979947. The next prime is 1979993. The reversal of 1979980 is 899791.

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 3 ways as a sum of consecutive naturals, for example, 49480 + ... + 49519.

It is an arithmetic number, because the mean of its divisors is an integer number (346500).

2^1979980 is an apocalyptic number.

1979980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1979980 is an abundant number, since it is smaller than the sum of its proper divisors (2178020).

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

1979980 is a wasteful number, since it uses less digits than its factorization.

1979980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99008 (or 99006 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1979980 is about 1407.1176212385. The cubic root of 1979980 is about 125.5703007659.

The spelling of 1979980 in words is "one million, nine hundred seventy-nine thousand, nine hundred eighty".