1659641 has 8 divisors (see below), whose sum is σ = 1732800. Its totient is φ = 1587600.

The previous prime is 1659629. The next prime is 1659643. The reversal of 1659641 is 1469561.

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

It is a cyclic number.

It is not a de Polignac number, because 1659641 - 2¹⁰ = 1658617 is a prime.

It is a super-3 number, since 3×1659641³ = 13713986581743335163, which contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1659598 and 1659607.

It is not an unprimeable number, because it can be changed into a prime (1659643) 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, 4190 + ... + 4568.

It is an arithmetic number, because the mean of its divisors is an integer number (216600).

2^1659641 is an apocalyptic number.

It is an amenable number.

1659641 is a deficient number, since it is larger than the sum of its proper divisors (73159).

1659641 is a wasteful number, since it uses less digits than its factorization.

1659641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559.

The product of its digits is 6480, while the sum is 32.

The square root of 1659641 is about 1288.2705461199. The cubic root of 1659641 is about 118.3962785308.

The spelling of 1659641 in words is "one million, six hundred fifty-nine thousand, six hundred forty-one".