1660693 has 4 divisors (see below), whose sum is σ = 1664640. Its totient is φ = 1656748.

The previous prime is 1660691. The next prime is 1660697. The reversal of 1660693 is 3960661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3960661 = 541 ⋅7321.

It is a cyclic number.

It is not a de Polignac number, because 1660693 - 2¹ = 1660691 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255 + ... + 2212.

It is an arithmetic number, because the mean of its divisors is an integer number (416160).

2^1660693 is an apocalyptic number.

It is an amenable number.

1660693 is a deficient number, since it is larger than the sum of its proper divisors (3947).

1660693 is an equidigital number, since it uses as much as digits as its factorization.

1660693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 1660693 is about 1288.6787807673. The cubic root of 1660693 is about 118.4212892765.

Subtracting 1660693 from its reverse (3960661), we obtain a cube (2299968 = 132³).

The spelling of 1660693 in words is "one million, six hundred sixty thousand, six hundred ninety-three".