1858444816 has 40 divisors (see below), whose sum is σ = 3750039000. Its totient is φ = 891125760.

The previous prime is 1858444793. The next prime is 1858444921. The reversal of 1858444816 is 6184448581.

It can be written as a sum of positive squares in 4 ways, for example, as 198697216 + 1659747600 = 14096^2 + 40740^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1858444816.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55696 + ... + 82576.

It is an arithmetic number, because the mean of its divisors is an integer number (93750975).

Almost surely, 2^1858444816 is an apocalyptic number.

1858444816 is a gapful number since it is divisible by the number (16) 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 1858444816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1875019500).

1858444816 is an abundant number, since it is smaller than the sum of its proper divisors (1891594184).

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

1858444816 is a wasteful number, since it uses less digits than its factorization.

1858444816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27067 (or 27061 counting only the distinct ones).

The product of its digits is 983040, while the sum is 49.

The square root of 1858444816 is about 43109.6835525384. The cubic root of 1858444816 is about 1229.4660947628.

The spelling of 1858444816 in words is "one billion, eight hundred fifty-eight million, four hundred forty-four thousand, eight hundred sixteen".