820126 has 4 divisors (see below), whose sum is σ = 1230192. Its totient is φ = 410062.

The previous prime is 820117. The next prime is 820129. The reversal of 820126 is 621028.

It is a happy number.

820126 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205030 + ... + 205033.

It is an arithmetic number, because the mean of its divisors is an integer number (307548).

2⁸²⁰¹²⁶ is an apocalyptic number.

820126 is a deficient number, since it is larger than the sum of its proper divisors (410066).

820126 is a wasteful number, since it uses less digits than its factorization.

820126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410065.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 820126 is about 905.6080830028. The cubic root of 820126 is about 93.6038100818.

It can be divided in two parts, 820 and 126, that added together give a triangular number (946 = T₄₃).

The spelling of 820126 in words is "eight hundred twenty thousand, one hundred twenty-six".