1990326 has 64 divisors (see below), whose sum is σ = 4838400. Its totient is φ = 539136.

The previous prime is 1990321. The next prime is 1990327. The reversal of 1990326 is 6230991.

It is a super-2 number, since 2×1990326² = 7922795172552, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1990293 and 1990302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990321) 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, 25155 + ... + 25233.

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

2^1990326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1990326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2419200).

1990326 is an abundant number, since it is smaller than the sum of its proper divisors (2848074).

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

1990326 is a wasteful number, since it uses less digits than its factorization.

1990326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 1990326 is about 1410.7891408712. The cubic root of 1990326 is about 125.7886353044.

The spelling of 1990326 in words is "one million, nine hundred ninety thousand, three hundred twenty-six".