1983722520 has 256 divisors, whose sum is σ = 6849722880. Its totient is φ = 455270400.

The previous prime is 1983722509. The next prime is 1983722549. The reversal of 1983722520 is 252273891.

It is a Cunningham number, because it is equal to 44539²-1.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3473835 + ... + 3474405.

It is an arithmetic number, because the mean of its divisors is an integer number (26756730).

Almost surely, 2^1983722520 is an apocalyptic number.

1983722520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1983722520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3424861440).

1983722520 is an abundant number, since it is smaller than the sum of its proper divisors (4866000360).

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

1983722520 is a wasteful number, since it uses less digits than its factorization.

1983722520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 1983722520 is about 44538.9999887739. Note that the first 4 decimals coincide. The cubic root of 1983722520 is about 1256.4936782319.

The spelling of 1983722520 in words is "one billion, nine hundred eighty-three million, seven hundred twenty-two thousand, five hundred twenty".