842490 has 96 divisors (see below), whose sum is σ = 2560896. Its totient is φ = 190080.

The previous prime is 842489. The next prime is 842497. The reversal of 842490 is 94248.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22752 + ... + 22788.

It is an arithmetic number, because the mean of its divisors is an integer number (26676).

2⁸⁴²⁴⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 842490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1280448).

842490 is an abundant number, since it is smaller than the sum of its proper divisors (1718406).

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

842490 is a wasteful number, since it uses less digits than its factorization.

842490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 842490 is about 917.8725401710. The cubic root of 842490 is about 94.4470182561.

The spelling of 842490 in words is "eight hundred forty-two thousand, four hundred ninety".