6420826 has 4 divisors (see below), whose sum is σ = 9631242. Its totient is φ = 3210412.

The previous prime is 6420823. The next prime is 6420833. The reversal of 6420826 is 6280246.

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

It can be written as a sum of positive squares in only one way, i.e., 4601025 + 1819801 = 2145^2 + 1349^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6420794 and 6420803.

It is not an unprimeable number, because it can be changed into a prime (6420823) 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 as a sum of consecutive naturals, namely, 1605205 + ... + 1605208.

Almost surely, 2^6420826 is an apocalyptic number.

6420826 is a deficient number, since it is larger than the sum of its proper divisors (3210416).

6420826 is a wasteful number, since it uses less digits than its factorization.

6420826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210415.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 6420826 is about 2533.9348847198. The cubic root of 6420826 is about 185.8647222322.

The spelling of 6420826 in words is "six million, four hundred twenty thousand, eight hundred twenty-six".