1996021980 has 96 divisors (see below), whose sum is σ = 6377743680. Its totient is φ = 517881600.

The previous prime is 1996021967. The next prime is 1996022023. The reversal of 1996021980 is 891206991.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29971 + ... + 69930.

It is an arithmetic number, because the mean of its divisors is an integer number (66434830).

Almost surely, 2^1996021980 is an apocalyptic number.

1996021980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1996021980 is an abundant number, since it is smaller than the sum of its proper divisors (4381721700).

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

1996021980 is a wasteful number, since it uses less digits than its factorization.

1996021980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99956 (or 99948 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 1996021980 is about 44676.8617966840. The cubic root of 1996021980 is about 1259.0851635985.

It can be divided in two parts, 1996021 and 980, that added together give a triangular number (1997001 = T₁₉₉₈).

The spelling of 1996021980 in words is "one billion, nine hundred ninety-six million, twenty-one thousand, nine hundred eighty".