1990539 has 6 divisors (see below), whose sum is σ = 2875236. Its totient is φ = 1327020.

The previous prime is 1990529. The next prime is 1990543. The reversal of 1990539 is 9350991.

It is not a de Polignac number, because 1990539 - 2⁴ = 1990523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1990529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110577 + ... + 110594.

It is an arithmetic number, because the mean of its divisors is an integer number (479206).

2^1990539 is an apocalyptic number.

1990539 is a deficient number, since it is larger than the sum of its proper divisors (884697).

1990539 is a wasteful number, since it uses less digits than its factorization.

1990539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221177 (or 221174 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 1990539 is about 1410.8646285169. The cubic root of 1990539 is about 125.7931223455.

The spelling of 1990539 in words is "one million, nine hundred ninety thousand, five hundred thirty-nine".