1980349756 has 24 divisors (see below), whose sum is σ = 4320763776. Its totient is φ = 771564720.

The previous prime is 1980349739. The next prime is 1980349757. The reversal of 1980349756 is 6579430891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980349757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3214546 + ... + 3215161.

It is an arithmetic number, because the mean of its divisors is an integer number (180031824).

Almost surely, 2^1980349756 is an apocalyptic number.

It is an amenable number.

1980349756 is an abundant number, since it is smaller than the sum of its proper divisors (2340414020).

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

1980349756 is a wasteful number, since it uses less digits than its factorization.

1980349756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6429729 (or 6429727 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 1980349756 is about 44501.1208398171. The cubic root of 1980349756 is about 1255.7811691931.

The spelling of 1980349756 in words is "one billion, nine hundred eighty million, three hundred forty-nine thousand, seven hundred fifty-six".