1598665 has 4 divisors (see below), whose sum is σ = 1918404. Its totient is φ = 1278928.

The previous prime is 1598651. The next prime is 1598669. The reversal of 1598665 is 5668951.

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 976144 + 622521 = 988^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 1598665 - 2⁵ = 1598633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1598669) 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, 159862 + ... + 159871.

It is an arithmetic number, because the mean of its divisors is an integer number (479601).

2^1598665 is an apocalyptic number.

It is an amenable number.

1598665 is a deficient number, since it is larger than the sum of its proper divisors (319739).

1598665 is an equidigital number, since it uses as much as digits as its factorization.

1598665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319738.

The product of its digits is 64800, while the sum is 40.

The square root of 1598665 is about 1264.3832488609. The cubic root of 1598665 is about 116.9281707797.

The spelling of 1598665 in words is "one million, five hundred ninety-eight thousand, six hundred sixty-five".