1866499140 has 96 divisors (see below), whose sum is σ = 5731238016. Its totient is φ = 450109440.

The previous prime is 1866499127. The next prime is 1866499147. The reversal of 1866499140 is 419946681.

It is a self number, because there is not a number n which added to its sum of digits gives 1866499140.

It is not an unprimeable number, because it can be changed into a prime (1866499147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120054 + ... + 134706.

It is an arithmetic number, because the mean of its divisors is an integer number (59700396).

Almost surely, 2^1866499140 is an apocalyptic number.

1866499140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866499140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2865619008).

1866499140 is an abundant number, since it is smaller than the sum of its proper divisors (3864738876).

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

1866499140 is a wasteful number, since it uses less digits than its factorization.

1866499140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14869 (or 14867 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 1866499140 is about 43202.9992014443. Note that the first 3 decimals coincide. The cubic root of 1866499140 is about 1231.2396649738.

The spelling of 1866499140 in words is "one billion, eight hundred sixty-six million, four hundred ninety-nine thousand, one hundred forty".