840490 has 16 divisors (see below), whose sum is σ = 1729152. Its totient is φ = 288144.

The previous prime is 840479. The next prime is 840491. The reversal of 840490 is 94048.

840490 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 not an unprimeable number, because it can be changed into a prime (840491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5934 + ... + 6073.

It is an arithmetic number, because the mean of its divisors is an integer number (108072).

2⁸⁴⁰⁴⁹⁰ is an apocalyptic number.

840490 is an abundant number, since it is smaller than the sum of its proper divisors (888662).

It is a weird number, because it is abundant, but not a pseudoperfect number.

840490 is a wasteful number, since it uses less digits than its factorization.

840490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12021.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 840490 is about 916.7824169344. The cubic root of 840490 is about 94.3722226278.

The spelling of 840490 in words is "eight hundred forty thousand, four hundred ninety".