1665797 has 4 divisors (see below), whose sum is σ = 1903776. Its totient is φ = 1427820.

The previous prime is 1665767. The next prime is 1665823. The reversal of 1665797 is 7975661.

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: 7975661 = 277 ⋅28793.

It is a cyclic number.

It is not a de Polignac number, because 1665797 - 2¹⁸ = 1403653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665757) 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, 118979 + ... + 118992.

It is an arithmetic number, because the mean of its divisors is an integer number (475944).

2^1665797 is an apocalyptic number.

It is an amenable number.

1665797 is a deficient number, since it is larger than the sum of its proper divisors (237979).

1665797 is an equidigital number, since it uses as much as digits as its factorization.

1665797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237978.

The product of its digits is 79380, while the sum is 41.

The square root of 1665797 is about 1290.6575843344. The cubic root of 1665797 is about 118.5424844848.

The spelling of 1665797 in words is "one million, six hundred sixty-five thousand, seven hundred ninety-seven".