1980211840 has 48 divisors (see below), whose sum is σ = 4736636730. Its totient is φ = 791634432.

The previous prime is 1980211823. The next prime is 1980211897. The reversal of 1980211840 is 481120891.

It can be written as a sum of positive squares in only one way, i.e., 1782190656 + 198021184 = 42216^2 + 14072^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1980211796 and 1980211805.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1124881 + ... + 1126639.

Almost surely, 2^1980211840 is an apocalyptic number.

1980211840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1980211840 is an abundant number, since it is smaller than the sum of its proper divisors (2756424890).

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

1980211840 is an frugal number, since it uses more digits than its factorization.

1980211840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537 (or 1766 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 1980211840 is about 44499.5712338894. The cubic root of 1980211840 is about 1255.7520167103.

The spelling of 1980211840 in words is "one billion, nine hundred eighty million, two hundred eleven thousand, eight hundred forty".