1981762512 has 20 divisors (see below), whose sum is σ = 5119553280. Its totient is φ = 660587488.

The previous prime is 1981762499. The next prime is 1981762553. The reversal of 1981762512 is 2152671891.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20643312 + ... + 20643407.

It is an arithmetic number, because the mean of its divisors is an integer number (255977664).

Almost surely, 2^1981762512 is an apocalyptic number.

1981762512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1981762512 is an abundant number, since it is smaller than the sum of its proper divisors (3137790768).

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

1981762512 is a wasteful number, since it uses less digits than its factorization.

1981762512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41286730 (or 41286724 counting only the distinct ones).

The product of its digits is 60480, while the sum is 42.

The square root of 1981762512 is about 44516.9912729960. The cubic root of 1981762512 is about 1256.0797175795.

The spelling of 1981762512 in words is "one billion, nine hundred eighty-one million, seven hundred sixty-two thousand, five hundred twelve".