1961823820 has 36 divisors (see below), whose sum is σ = 4528413792. Its totient is φ = 713389600.

The previous prime is 1961823811. The next prime is 1961823841. The reversal of 1961823820 is 283281691.

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 11 ways as a sum of consecutive naturals, for example, 402916 + ... + 407755.

It is an arithmetic number, because the mean of its divisors is an integer number (125789272).

Almost surely, 2^1961823820 is an apocalyptic number.

1961823820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1961823820 is an abundant number, since it is smaller than the sum of its proper divisors (2566589972).

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

1961823820 is a wasteful number, since it uses less digits than its factorization.

1961823820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810702 (or 810689 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1961823820 is about 44292.4804001763. The cubic root of 1961823820 is about 1251.8530000221.

It can be divided in two parts, 196182 and 3820, that added together give a palindrome (200002).

The spelling of 1961823820 in words is "one billion, nine hundred sixty-one million, eight hundred twenty-three thousand, eight hundred twenty".