1861924816 has 20 divisors (see below), whose sum is σ = 3731876100. Its totient is φ = 898860032.

The previous prime is 1861924793. The next prime is 1861924829. The reversal of 1861924816 is 6184291681.

It can be written as a sum of positive squares in 2 ways, for example, as 1528497216 + 333427600 = 39096^2 + 18260^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2005921 + ... + 2006848.

It is an arithmetic number, because the mean of its divisors is an integer number (186593805).

Almost surely, 2^1861924816 is an apocalyptic number.

1861924816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1861924816 is an abundant number, since it is smaller than the sum of its proper divisors (1869951284).

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

1861924816 is a wasteful number, since it uses less digits than its factorization.

1861924816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4012806 (or 4012800 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The square root of 1861924816 is about 43150.0268366081. The cubic root of 1861924816 is about 1230.2330217075.

The spelling of 1861924816 in words is "one billion, eight hundred sixty-one million, nine hundred twenty-four thousand, eight hundred sixteen".