1866021762 has 64 divisors (see below), whose sum is σ = 4459536000. Its totient is φ = 513838080.

The previous prime is 1866021743. The next prime is 1866021767. The reversal of 1866021762 is 2671206681.

It is a self number, because there is not a number n which added to its sum of digits gives 1866021762.

It is not an unprimeable number, because it can be changed into a prime (1866021767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3864 + ... + 61212.

It is an arithmetic number, because the mean of its divisors is an integer number (69680250).

Almost surely, 2^1866021762 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866021762, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2229768000).

1866021762 is an abundant number, since it is smaller than the sum of its proper divisors (2593514238).

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

1866021762 is a wasteful number, since it uses less digits than its factorization.

1866021762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57411.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1866021762 is about 43197.4740233732. The cubic root of 1866021762 is about 1231.1346882587.

The spelling of 1866021762 in words is "one billion, eight hundred sixty-six million, twenty-one thousand, seven hundred sixty-two".