1662859 has 4 divisors (see below), whose sum is σ = 1814040. Its totient is φ = 1511680.

The previous prime is 1662851. The next prime is 1662863. The reversal of 1662859 is 9582661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1662859 - 2³ = 1662851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75574 + ... + 75595.

It is an arithmetic number, because the mean of its divisors is an integer number (453510).

2^1662859 is an apocalyptic number.

1662859 is a deficient number, since it is larger than the sum of its proper divisors (151181).

1662859 is a wasteful number, since it uses less digits than its factorization.

1662859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151180.

The product of its digits is 25920, while the sum is 37.

The square root of 1662859 is about 1289.5189025369. The cubic root of 1662859 is about 118.4727515431.

It can be divided in two parts, 166 and 2859, that added together give a square (3025 = 55²).

The spelling of 1662859 in words is "one million, six hundred sixty-two thousand, eight hundred fifty-nine".