840236 has 12 divisors (see below), whose sum is σ = 1534512. Its totient is φ = 401808.

The previous prime is 840223. The next prime is 840239. The reversal of 840236 is 632048.

It is a happy number.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (840239) by changing a digit.

840236 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4475 + ... + 4658.

It is an arithmetic number, because the mean of its divisors is an integer number (127876).

2⁸⁴⁰²³⁶ is an apocalyptic number.

It is an amenable number.

840236 is a deficient number, since it is larger than the sum of its proper divisors (694276).

840236 is a wasteful number, since it uses less digits than its factorization.

840236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9160 (or 9158 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 840236 is about 916.6438785046. The cubic root of 840236 is about 94.3627150946.

The spelling of 840236 in words is "eight hundred forty thousand, two hundred thirty-six".