1990836 has 36 divisors (see below), whose sum is σ = 5330052. Its totient is φ = 624384.

The previous prime is 1990831. The next prime is 1990867. The reversal of 1990836 is 6380991.

It can be written as a sum of positive squares in 2 ways, for example, as 1838736 + 152100 = 1356^2 + 390^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1990836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1015 + ... + 2238.

It is an arithmetic number, because the mean of its divisors is an integer number (148057).

2^1990836 is an apocalyptic number.

It is an amenable number.

1990836 is an abundant number, since it is smaller than the sum of its proper divisors (3339216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1990836 is a wasteful number, since it uses less digits than its factorization.

1990836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280 (or 3275 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1990836 is about 1410.9698791966. The cubic root of 1990836 is about 125.7993783896.

The spelling of 1990836 in words is "one million, nine hundred ninety thousand, eight hundred thirty-six".