1660791 has 16 divisors (see below), whose sum is σ = 2459520. Its totient is φ = 988320.

The previous prime is 1660783. The next prime is 1660793. The reversal of 1660791 is 1970661.

It is not a de Polignac number, because 1660791 - 2³ = 1660783 is a prime.

1660791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1521 + ... + 2373.

It is an arithmetic number, because the mean of its divisors is an integer number (153720).

2^1660791 is an apocalyptic number.

1660791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1660791 is a deficient number, since it is larger than the sum of its proper divisors (798729).

1660791 is a wasteful number, since it uses less digits than its factorization.

1660791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1660791 is about 1288.7168036462. The cubic root of 1660791 is about 118.4236186371.

The spelling of 1660791 in words is "one million, six hundred sixty thousand, seven hundred ninety-one".