1986530840 has 128 divisors (see below), whose sum is σ = 5341593600. Its totient is φ = 650557440.

The previous prime is 1986530737. The next prime is 1986530857. The reversal of 1986530840 is 480356891.

It is a super-2 number, since 2×1986530840² = 7892609556542211200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1986530791 and 1986530800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 684272 + ... + 687168.

It is an arithmetic number, because the mean of its divisors is an integer number (41731200).

Almost surely, 2^1986530840 is an apocalyptic number.

1986530840 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 1986530840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2670796800).

1986530840 is an abundant number, since it is smaller than the sum of its proper divisors (3355062760).

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

1986530840 is a wasteful number, since it uses less digits than its factorization.

1986530840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3025 (or 3021 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 1986530840 is about 44570.5153661027. The cubic root of 1986530840 is about 1257.0863304227.

It can be divided in two parts, 19865 and 30840, that added together give a palindrome (50705).

The spelling of 1986530840 in words is "one billion, nine hundred eighty-six million, five hundred thirty thousand, eight hundred forty".