1990386 has 64 divisors (see below), whose sum is σ = 4838400. Its totient is φ = 604800.

The previous prime is 1990381. The next prime is 1990433. The reversal of 1990386 is 6830991.

It is a self number, because there is not a number n which added to its sum of digits gives 1990386.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48526 + ... + 48566.

It is an arithmetic number, because the mean of its divisors is an integer number (75600).

2^1990386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1990386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2419200).

1990386 is an abundant number, since it is smaller than the sum of its proper divisors (2848014).

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

1990386 is a wasteful number, since it uses less digits than its factorization.

1990386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 106 counting only the distinct ones).

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

The square root of 1990386 is about 1410.8104054053. The cubic root of 1990386 is about 125.7898992921.

The spelling of 1990386 in words is "one million, nine hundred ninety thousand, three hundred eighty-six".