1861411806 has 64 divisors (see below), whose sum is σ = 4288680000. Its totient is φ = 597735936.

The previous prime is 1861411793. The next prime is 1861411807. The reversal of 1861411806 is 6081141681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861411807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 890010 + ... + 892098.

It is an arithmetic number, because the mean of its divisors is an integer number (67010625).

Almost surely, 2^1861411806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861411806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2144340000).

1861411806 is an abundant number, since it is smaller than the sum of its proper divisors (2427268194).

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

1861411806 is a wasteful number, since it uses less digits than its factorization.

1861411806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698 (or 2692 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1861411806 is about 43144.0819348378. The cubic root of 1861411806 is about 1230.1200239807.

The spelling of 1861411806 in words is "one billion, eight hundred sixty-one million, four hundred eleven thousand, eight hundred six".