840880 has 40 divisors (see below), whose sum is σ = 2044512. Its totient is φ = 321024.

The previous prime is 840863. The next prime is 840907. The reversal of 840880 is 88048.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

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, 1612 + ... + 2068.

2⁸⁴⁰⁸⁸⁰ is an apocalyptic number.

840880 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 840880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1022256).

840880 is an abundant number, since it is smaller than the sum of its proper divisors (1203632).

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

840880 is a wasteful number, since it uses less digits than its factorization.

840880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 840880 is about 916.9950926804. The cubic root of 840880 is about 94.3868170809.

The spelling of 840880 in words is "eight hundred forty thousand, eight hundred eighty".