1990926 has 64 divisors (see below), whose sum is σ = 5299200. Its totient is φ = 541728.

The previous prime is 1990907. The next prime is 1990927. The reversal of 1990926 is 6290991.

1990926 = 704² + 705² + ... + 707².

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990927) 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, 8580 + ... + 8808.

It is an arithmetic number, because the mean of its divisors is an integer number (82800).

2^1990926 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1990926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2649600).

1990926 is an abundant number, since it is smaller than the sum of its proper divisors (3308274).

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

1990926 is a wasteful number, since it uses less digits than its factorization.

1990926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 1990926 is about 1411.0017717919. The cubic root of 1990926 is about 125.8012740377.

It can be divided in two parts, 1990 and 926, that added together give a square (2916 = 54²).

The spelling of 1990926 in words is "one million, nine hundred ninety thousand, nine hundred twenty-six".