801990 has 96 divisors (see below), whose sum is σ = 2545920. Its totient is φ = 171072.

The previous prime is 801989. The next prime is 802007. The reversal of 801990 is 99108.

801990 = T₂₈₁ + T₂₈₂ + ... + T₂₉₉.

801990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11937 + ... + 12003.

It is an arithmetic number, because the mean of its divisors is an integer number (26520).

2⁸⁰¹⁹⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 801990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1272960).

801990 is an abundant number, since it is smaller than the sum of its proper divisors (1743930).

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

801990 is a wasteful number, since it uses less digits than its factorization.

801990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 801990 is about 895.5389438768. The cubic root of 801990 is about 92.9086859517.

The spelling of 801990 in words is "eight hundred one thousand, nine hundred ninety".