1982969780 has 36 divisors (see below), whose sum is σ = 4577224260. Its totient is φ = 721079040.

The previous prime is 1982969773. The next prime is 1982969819. The reversal of 1982969780 is 879692891.

It can be written as a sum of positive squares in 2 ways, for example, as 1403701156 + 579268624 = 37466^2 + 24068^2 .

It is a super-3 number, since 3×1982969780³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 407285 + ... + 412124.

Almost surely, 2^1982969780 is an apocalyptic number.

1982969780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1982969780 is an abundant number, since it is smaller than the sum of its proper divisors (2594254480).

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

1982969780 is a wasteful number, since it uses less digits than its factorization.

1982969780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819440 (or 819427 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 59.

The square root of 1982969780 is about 44530.5488400940. The cubic root of 1982969780 is about 1256.3347291350.

The spelling of 1982969780 in words is "one billion, nine hundred eighty-two million, nine hundred sixty-nine thousand, seven hundred eighty".