6420829 has 4 divisors (see below), whose sum is σ = 6461884. Its totient is φ = 6379776.

The previous prime is 6420823. The next prime is 6420833. The reversal of 6420829 is 9280246.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3892729 + 2528100 = 1973^2 + 1590^2 .

It is a cyclic number.

It is not a de Polignac number, because 6420829 - 2¹⁵ = 6388061 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6420829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20292 + ... + 20605.

It is an arithmetic number, because the mean of its divisors is an integer number (1615471).

Almost surely, 2^6420829 is an apocalyptic number.

It is an amenable number.

6420829 is a deficient number, since it is larger than the sum of its proper divisors (41055).

6420829 is a wasteful number, since it uses less digits than its factorization.

6420829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41054.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 6420829 is about 2533.9354766844. The cubic root of 6420829 is about 185.8647511793.

The spelling of 6420829 in words is "six million, four hundred twenty thousand, eight hundred twenty-nine".