1971980 has 24 divisors (see below), whose sum is σ = 4239312. Its totient is φ = 770112.

The previous prime is 1971967. The next prime is 1972007. The reversal of 1971980 is 891791.

It is a self number, because there is not a number n which added to its sum of digits gives 1971980.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287 + ... + 2006.

It is an arithmetic number, because the mean of its divisors is an integer number (176638).

2^1971980 is an apocalyptic number.

1971980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1971980 is an abundant number, since it is smaller than the sum of its proper divisors (2267332).

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

1971980 is a wasteful number, since it uses less digits than its factorization.

1971980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2345 (or 2343 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 1971980 is about 1404.2720534142. The cubic root of 1971980 is about 125.4009525215.

The spelling of 1971980 in words is "one million, nine hundred seventy-one thousand, nine hundred eighty".