1985609 has 8 divisors (see below), whose sum is σ = 2056320. Its totient is φ = 1916176.

The previous prime is 1985593. The next prime is 1985623. The reversal of 1985609 is 9065891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1985609 - 2⁴ = 1985593 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1985639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3647 + ... + 4155.

It is an arithmetic number, because the mean of its divisors is an integer number (257040).

2^1985609 is an apocalyptic number.

It is an amenable number.

1985609 is a deficient number, since it is larger than the sum of its proper divisors (70711).

1985609 is an equidigital number, since it uses as much as digits as its factorization.

1985609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639.

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

The square root of 1985609 is about 1409.1163897989. The cubic root of 1985609 is about 125.6891852066.

The spelling of 1985609 in words is "one million, nine hundred eighty-five thousand, six hundred nine".