840242 has 16 divisors (see below), whose sum is σ = 1437912. Its totient is φ = 364800.

The previous prime is 840241. The next prime is 840253. The reversal of 840242 is 242048.

It can be written as a sum of positive squares in 4 ways, for example, as 502681 + 337561 = 709^2 + 581^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840242.

It is not an unprimeable number, because it can be changed into a prime (840241) 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, 509 + ... + 1392.

2⁸⁴⁰²⁴² is an apocalyptic number.

840242 is a deficient number, since it is larger than the sum of its proper divisors (597670).

840242 is a wasteful number, since it uses less digits than its factorization.

840242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 840242 is about 916.6471513074. The cubic root of 840242 is about 94.3629397041.

The spelling of 840242 in words is "eight hundred forty thousand, two hundred forty-two".