6420245 has 8 divisors (see below), whose sum is σ = 8297016. Its totient is φ = 4741056.

The previous prime is 6420221. The next prime is 6420259. The reversal of 6420245 is 5420246.

6420245 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 358801 + 6061444 = 599^2 + 2462^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6420245 - 2⁸ = 6419989 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6420245.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 49322 + ... + 49451.

It is an arithmetic number, because the mean of its divisors is an integer number (1037127).

Almost surely, 2^6420245 is an apocalyptic number.

6420245 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6420245 is a deficient number, since it is larger than the sum of its proper divisors (1876771).

6420245 is a wasteful number, since it uses less digits than its factorization.

6420245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98791.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 6420245 is about 2533.8202382963. The cubic root of 6420245 is about 185.8591159617.

Subtracting from 6420245 its reverse (5420246), we obtain a palindrome (999999).

The spelling of 6420245 in words is "six million, four hundred twenty thousand, two hundred forty-five".