1861000806 has 16 divisors (see below), whose sum is σ = 4253716224. Its totient is φ = 531714504.

The previous prime is 1861000793. The next prime is 1861000831. The reversal of 1861000806 is 6080001681.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22154730 + ... + 22154813.

It is an arithmetic number, because the mean of its divisors is an integer number (265857264).

Almost surely, 2^1861000806 is an apocalyptic number.

1861000806 is an abundant number, since it is smaller than the sum of its proper divisors (2392715418).

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

1861000806 is a wasteful number, since it uses less digits than its factorization.

1861000806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44309555.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1861000806 is about 43139.3185620728. The cubic root of 1861000806 is about 1230.0294804224.

The spelling of 1861000806 in words is "one billion, eight hundred sixty-one million, eight hundred six", and thus it is an aban number.