1866459540 has 48 divisors (see below), whose sum is σ = 5701187520. Its totient is φ = 452474880.

The previous prime is 1866459527. The next prime is 1866459557. The reversal of 1866459540 is 459546681.

It is a self number, because there is not a number n which added to its sum of digits gives 1866459540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1413325 + ... + 1414644.

It is an arithmetic number, because the mean of its divisors is an integer number (118774740).

Almost surely, 2^1866459540 is an apocalyptic number.

1866459540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866459540 is an abundant number, since it is smaller than the sum of its proper divisors (3834727980).

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

1866459540 is a wasteful number, since it uses less digits than its factorization.

1866459540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827992 (or 2827990 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 48.

The square root of 1866459540 is about 43202.5408974981. The cubic root of 1866459540 is about 1231.2309575074.

The spelling of 1866459540 in words is "one billion, eight hundred sixty-six million, four hundred fifty-nine thousand, five hundred forty".