1866694856 has 32 divisors (see below), whose sum is σ = 3773582400. Its totient is φ = 860569920.

The previous prime is 1866694847. The next prime is 1866694859. The reversal of 1866694856 is 6584966681.

It is a junction number, because it is equal to n+sod(n) for n = 1866694795 and 1866694804.

It is not an unprimeable number, because it can be changed into a prime (1866694859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85811 + ... + 105341.

It is an arithmetic number, because the mean of its divisors is an integer number (117924450).

Almost surely, 2^1866694856 is an apocalyptic number.

It is an amenable number.

1866694856 is an abundant number, since it is smaller than the sum of its proper divisors (1906887544).

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

1866694856 is a wasteful number, since it uses less digits than its factorization.

1866694856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20469 (or 20465 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 59.

The square root of 1866694856 is about 43205.2642162966. The cubic root of 1866694856 is about 1231.2826982787.

The spelling of 1866694856 in words is "one billion, eight hundred sixty-six million, six hundred ninety-four thousand, eight hundred fifty-six".