1866946536 has 256 divisors, whose sum is σ = 6720000000. Its totient is φ = 466373376.

The previous prime is 1866946531. The next prime is 1866946561. The reversal of 1866946536 is 6356496681.

1866946536 is a `hidden beast` number, since 1 + 8 + 6 + 69 + 46 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1866946531) 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 63 ways as a sum of consecutive naturals, for example, 370965 + ... + 375963.

It is an arithmetic number, because the mean of its divisors is an integer number (26250000).

Almost surely, 2^1866946536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866946536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3360000000).

1866946536 is an abundant number, since it is smaller than the sum of its proper divisors (4853053464).

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

1866946536 is a wasteful number, since it uses less digits than its factorization.

1866946536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5053 (or 5043 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 1866946536 is about 43208.1767261707. The cubic root of 1866946536 is about 1231.3380323187.

The spelling of 1866946536 in words is "one billion, eight hundred sixty-six million, nine hundred forty-six thousand, five hundred thirty-six".