1845516820 has 48 divisors (see below), whose sum is σ = 4433764608. Its totient is φ = 632102400.

The previous prime is 1845516811. The next prime is 1845516839. The reversal of 1845516820 is 286155481.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142620 + ... + 155020.

It is an arithmetic number, because the mean of its divisors is an integer number (92370096).

Almost surely, 2^1845516820 is an apocalyptic number.

1845516820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1845516820 is an abundant number, since it is smaller than the sum of its proper divisors (2588247788).

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

1845516820 is a wasteful number, since it uses less digits than its factorization.

1845516820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13480 (or 13478 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 1845516820 is about 42959.4788143432. The cubic root of 1845516820 is about 1226.6085923134.

The spelling of 1845516820 in words is "one billion, eight hundred forty-five million, five hundred sixteen thousand, eight hundred twenty".