836240 has 20 divisors (see below), whose sum is σ = 1944444. Its totient is φ = 334464.

The previous prime is 836239. The next prime is 836243. The reversal of 836240 is 42638.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 620944 + 215296 = 788^2 + 464^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (836243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5147 + ... + 5306.

2⁸³⁶²⁴⁰ is an apocalyptic number.

836240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

836240 is an abundant number, since it is smaller than the sum of its proper divisors (1108204).

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

836240 is a wasteful number, since it uses less digits than its factorization.

836240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10466 (or 10460 counting only the distinct ones).

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

The square root of 836240 is about 914.4615902267. The cubic root of 836240 is about 94.2128870477.

Adding to 836240 its reverse (42638), we get a palindrome (878878).

The spelling of 836240 in words is "eight hundred thirty-six thousand, two hundred forty".