1980911520 has 144 divisors (see below), whose sum is σ = 7725594240. Its totient is φ = 452777472.

The previous prime is 1980911509. The next prime is 1980911531. The reversal of 1980911520 is 251190891.

It is an interprime number because it is at equal distance from previous prime (1980911509) and next prime (1980911531).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88180 + ... + 108339.

It is an arithmetic number, because the mean of its divisors is an integer number (53649960).

Almost surely, 2^1980911520 is an apocalyptic number.

1980911520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1980911520 is an abundant number, since it is smaller than the sum of its proper divisors (5744682720).

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

1980911520 is a wasteful number, since it uses less digits than its factorization.

1980911520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196547 (or 196536 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 1980911520 is about 44507.4321883436. The cubic root of 1980911520 is about 1255.8999000648.

It can be divided in two parts, 19809 and 11520, that added together give a square (31329 = 177²).

The spelling of 1980911520 in words is "one billion, nine hundred eighty million, nine hundred eleven thousand, five hundred twenty".