1861019216 has 40 divisors (see below), whose sum is σ = 4204939200. Its totient is φ = 797577312.

The previous prime is 1861019213. The next prime is 1861019243. The reversal of 1861019216 is 6129101681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861019213) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 164066 + ... + 175041.

It is an arithmetic number, because the mean of its divisors is an integer number (105123480).

Almost surely, 2^1861019216 is an apocalyptic number.

1861019216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1861019216 is an abundant number, since it is smaller than the sum of its proper divisors (2343919984).

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

1861019216 is an equidigital number, since it uses as much as digits as its factorization.

1861019216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339136 (or 339116 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1861019216 is about 43139.5319399736. The cubic root of 1861019216 is about 1230.0335364421.

The spelling of 1861019216 in words is "one billion, eight hundred sixty-one million, nineteen thousand, two hundred sixteen".