1866393965 has 8 divisors (see below), whose sum is σ = 2248190208. Its totient is φ = 1487436880.

The previous prime is 1866393961. The next prime is 1866393983. The reversal of 1866393965 is 5693936681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1866393965 - 2² = 1866393961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1866393965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866393961) 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, 708341 + ... + 710970.

It is an arithmetic number, because the mean of its divisors is an integer number (281023776).

Almost surely, 2^1866393965 is an apocalyptic number.

It is an amenable number.

1866393965 is a deficient number, since it is larger than the sum of its proper divisors (381796243).

1866393965 is a wasteful number, since it uses less digits than its factorization.

1866393965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419579.

The product of its digits is 6298560, while the sum is 56.

The square root of 1866393965 is about 43201.7819655625. The cubic root of 1866393965 is about 1231.2165382439.

The spelling of 1866393965 in words is "one billion, eight hundred sixty-six million, three hundred ninety-three thousand, nine hundred sixty-five".