1866459340 has 24 divisors (see below), whose sum is σ = 3925540080. Its totient is φ = 745445568.

The previous prime is 1866459323. The next prime is 1866459349. The reversal of 1866459340 is 439546681.

It is not an unprimeable number, because it can be changed into a prime (1866459349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57627 + ... + 83986.

It is an arithmetic number, because the mean of its divisors is an integer number (163564170).

Almost surely, 2^1866459340 is an apocalyptic number.

1866459340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866459340 is an abundant number, since it is smaller than the sum of its proper divisors (2059080740).

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

1866459340 is a wasteful number, since it uses less digits than its factorization.

1866459340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142281 (or 142279 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 1866459340 is about 43202.5385828194. The cubic root of 1866459340 is about 1231.2309135300.

The spelling of 1866459340 in words is "one billion, eight hundred sixty-six million, four hundred fifty-nine thousand, three hundred forty".