1660993 has 4 divisors (see below), whose sum is σ = 1664388. Its totient is φ = 1657600.

The previous prime is 1660963. The next prime is 1661003. The reversal of 1660993 is 3990661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 935089 + 725904 = 967^2 + 852^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660993 - 2¹³ = 1652801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660943) 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, 808 + ... + 1993.

It is an arithmetic number, because the mean of its divisors is an integer number (416097).

2^1660993 is an apocalyptic number.

It is an amenable number.

1660993 is a deficient number, since it is larger than the sum of its proper divisors (3395).

1660993 is an equidigital number, since it uses as much as digits as its factorization.

1660993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 1660993 is about 1288.7951737961. The cubic root of 1660993 is about 118.4284196829.

It can be divided in two parts, 16 and 60993, that added together give a square (61009 = 247²).

The spelling of 1660993 in words is "one million, six hundred sixty thousand, nine hundred ninety-three".