1966859 has 4 divisors (see below), whose sum is σ = 1969704. Its totient is φ = 1964016.

The previous prime is 1966847. The next prime is 1966871. The reversal of 1966859 is 9586691.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (1966847) and next prime (1966871).

It is a cyclic number.

It is not a de Polignac number, because 1966859 - 2⁴ = 1966843 is a prime.

It is a super-3 number, since 3×1966859³ = 22826584667003933337, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359 + ... + 2015.

It is an arithmetic number, because the mean of its divisors is an integer number (492426).

2^1966859 is an apocalyptic number.

1966859 is a deficient number, since it is larger than the sum of its proper divisors (2845).

1966859 is a wasteful number, since it uses less digits than its factorization.

1966859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2844.

The product of its digits is 116640, while the sum is 44.

The square root of 1966859 is about 1402.4475034738. The cubic root of 1966859 is about 125.2923079158.

The spelling of 1966859 in words is "one million, nine hundred sixty-six thousand, eight hundred fifty-nine".