1986959 has 4 divisors (see below), whose sum is σ = 2139816. Its totient is φ = 1834104.

The previous prime is 1986949. The next prime is 1986967. The reversal of 1986959 is 9596891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9596891 = 17 ⋅564523.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1986959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986949) 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, 76409 + ... + 76434.

It is an arithmetic number, because the mean of its divisors is an integer number (534954).

2^1986959 is an apocalyptic number.

1986959 is a deficient number, since it is larger than the sum of its proper divisors (152857).

1986959 is a wasteful number, since it uses less digits than its factorization.

1986959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152856.

The product of its digits is 174960, while the sum is 47.

The square root of 1986959 is about 1409.5953320014. The cubic root of 1986959 is about 125.7176637842.

The spelling of 1986959 in words is "one million, nine hundred eighty-six thousand, nine hundred fifty-nine".