801840 has 80 divisors (see below), whose sum is σ = 2687328. Its totient is φ = 196608.

The previous prime is 801833. The next prime is 801841. The reversal of 801840 is 48108.

801840 = T₂₅ + T₂₆ + ... + T₁₆₈.

It is a tau number, because it is divible by the number of its divisors (80).

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (801841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2992 + ... + 3248.

2⁸⁰¹⁸⁴⁰ is an apocalyptic number.

801840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 801840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1343664).

801840 is an abundant number, since it is smaller than the sum of its proper divisors (1885488).

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

801840 is a wasteful number, since it uses less digits than its factorization.

801840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 801840 is about 895.4551915088. The cubic root of 801840 is about 92.9028932062.

Adding to 801840 its reverse (48108), we get a palindrome (849948).

The spelling of 801840 in words is "eight hundred one thousand, eight hundred forty".