1866339389 has 16 divisors (see below), whose sum is σ = 1929872640. Its totient is φ = 1804032000.

The previous prime is 1866339379. The next prime is 1866339401. The reversal of 1866339389 is 9839336681.

It is a cyclic number.

It is not a de Polignac number, because 1866339389 - 2¹⁶ = 1866273853 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866339359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2484764 + ... + 2485514.

It is an arithmetic number, because the mean of its divisors is an integer number (120617040).

Almost surely, 2^1866339389 is an apocalyptic number.

It is an amenable number.

1866339389 is a deficient number, since it is larger than the sum of its proper divisors (63533251).

1866339389 is an equidigital number, since it uses as much as digits as its factorization.

1866339389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460.

The product of its digits is 5038848, while the sum is 56.

The square root of 1866339389 is about 43201.1503203329. The cubic root of 1866339389 is about 1231.2045372891.

The spelling of 1866339389 in words is "one billion, eight hundred sixty-six million, three hundred thirty-nine thousand, three hundred eighty-nine".