840100 has 36 divisors (see below), whose sum is σ = 1888768. Its totient is φ = 324000.

The previous prime is 840083. The next prime is 840109. The reversal of 840100 is 1048.

It is not an unprimeable number, because it can be changed into a prime (840109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2965 + ... + 3235.

2⁸⁴⁰¹⁰⁰ 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 840100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (944384).

840100 is an abundant number, since it is smaller than the sum of its proper divisors (1048668).

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

840100 is a wasteful number, since it uses less digits than its factorization.

840100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 840100 is about 916.5696918402. The cubic root of 840100 is about 94.3576236593.

Adding to 840100 its reverse (1048), we get a palindrome (841148).

The spelling of 840100 in words is "eight hundred forty thousand, one hundred".