1990856 has 32 divisors (see below), whose sum is σ = 4333440. Its totient is φ = 839808.

The previous prime is 1990831. The next prime is 1990867. The reversal of 1990856 is 6580991.

It is a super-2 number, since 2×1990856² = 7927015225472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3845 + ... + 4331.

It is an arithmetic number, because the mean of its divisors is an integer number (135420).

2^1990856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1990856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2166720).

1990856 is an abundant number, since it is smaller than the sum of its proper divisors (2342584).

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

1990856 is a wasteful number, since it uses less digits than its factorization.

1990856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573 (or 569 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1990856 is about 1410.9769665023. The cubic root of 1990856 is about 125.7997996497.

The spelling of 1990856 in words is "one million, nine hundred ninety thousand, eight hundred fifty-six".