1598609 has 4 divisors (see below), whose sum is σ = 1604580. Its totient is φ = 1592640.

The previous prime is 1598587. The next prime is 1598617. The reversal of 1598609 is 9068951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9068951 = 2749 ⋅3299.

It can be written as a sum of positive squares in 2 ways, for example, as 1345600 + 253009 = 1160^2 + 503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1598609 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon 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, 2564 + ... + 3125.

It is an arithmetic number, because the mean of its divisors is an integer number (401145).

2^1598609 is an apocalyptic number.

It is an amenable number.

1598609 is a deficient number, since it is larger than the sum of its proper divisors (5971).

1598609 is an equidigital number, since it uses as much as digits as its factorization.

1598609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5970.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1598609 is about 1264.3611034827. The cubic root of 1598609 is about 116.9268054626.

The spelling of 1598609 in words is "one million, five hundred ninety-eight thousand, six hundred nine".