1985602 has 4 divisors (see below), whose sum is σ = 2978406. Its totient is φ = 992800.

The previous prime is 1985593. The next prime is 1985623. The reversal of 1985602 is 2065891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2065891 = 17 ⋅121523.

It can be written as a sum of positive squares in only one way, i.e., 1962801 + 22801 = 1401^2 + 151^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496399 + ... + 496402.

2^1985602 is an apocalyptic number.

1985602 is a deficient number, since it is larger than the sum of its proper divisors (992804).

1985602 is an equidigital number, since it uses as much as digits as its factorization.

1985602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992803.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1985602 is about 1409.1139059707. The cubic root of 1985602 is about 125.6890375063.

The spelling of 1985602 in words is "one million, nine hundred eighty-five thousand, six hundred two".