1866906858 has 16 divisors (see below), whose sum is σ = 3763215360. Its totient is φ = 617402016.

The previous prime is 1866906829. The next prime is 1866906859. The reversal of 1866906858 is 8586096681.

It is a junction number, because it is equal to n+sod(n) for n = 1866906798 and 1866906807.

It is not an unprimeable number, because it can be changed into a prime (1866906859) by changing a digit.

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, 1224243 + ... + 1225766.

It is an arithmetic number, because the mean of its divisors is an integer number (235200960).

Almost surely, 2^1866906858 is an apocalyptic number.

1866906858 is an abundant number, since it is smaller than the sum of its proper divisors (1896308502).

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

1866906858 is a wasteful number, since it uses less digits than its factorization.

1866906858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450141.

The product of its (nonzero) digits is 4976640, while the sum is 57.

The square root of 1866906858 is about 43207.7175745260. The cubic root of 1866906858 is about 1231.3293090951.

The spelling of 1866906858 in words is "one billion, eight hundred sixty-six million, nine hundred six thousand, eight hundred fifty-eight".