1659943 has 4 divisors (see below), whose sum is σ = 1671088. Its totient is φ = 1648800.

The previous prime is 1659919. The next prime is 1659971. The reversal of 1659943 is 3499561.

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 1659943 - 2⁹ = 1659431 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 (1659913) 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, 5346 + ... + 5647.

It is an arithmetic number, because the mean of its divisors is an integer number (417772).

2^1659943 is an apocalyptic number.

1659943 is a deficient number, since it is larger than the sum of its proper divisors (11145).

1659943 is a wasteful number, since it uses less digits than its factorization.

1659943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11144.

The product of its digits is 29160, while the sum is 37.

The square root of 1659943 is about 1288.3877521926. The cubic root of 1659943 is about 118.4034595029.

The spelling of 1659943 in words is "one million, six hundred fifty-nine thousand, nine hundred forty-three".