1980997940 has 24 divisors (see below), whose sum is σ = 4183087272. Its totient is φ = 788019840.

The previous prime is 1980997939. The next prime is 1980997979. The reversal of 1980997940 is 497990891.

It can be written as a sum of positive squares in 4 ways, for example, as 36893476 + 1944104464 = 6074^2 + 44092^2 .

It is a congruent number.

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, 269999 + ... + 277238.

It is an arithmetic number, because the mean of its divisors is an integer number (174295303).

Almost surely, 2^1980997940 is an apocalyptic number.

1980997940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1980997940 is an abundant number, since it is smaller than the sum of its proper divisors (2202089332).

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

1980997940 is a wasteful number, since it uses less digits than its factorization.

1980997940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547427 (or 547425 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 1980997940 is about 44508.4030268443. The cubic root of 1980997940 is about 1255.9181632549.

The spelling of 1980997940 in words is "one billion, nine hundred eighty million, nine hundred ninety-seven thousand, nine hundred forty".