620839 has 4 divisors (see below), whose sum is σ = 647856. Its totient is φ = 593824.

The previous prime is 620831. The next prime is 620849. The reversal of 620839 is 938026.

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

It is a cyclic number.

It is not a de Polignac number, because 620839 - 2³ = 620831 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13474 + ... + 13519.

It is an arithmetic number, because the mean of its divisors is an integer number (161964).

2⁶²⁰⁸³⁹ is an apocalyptic number.

620839 is a deficient number, since it is larger than the sum of its proper divisors (27017).

620839 is a wasteful number, since it uses less digits than its factorization.

620839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27016.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 620839 is about 787.9333728178. The cubic root of 620839 is about 85.3086357698.

The spelling of 620839 in words is "six hundred twenty thousand, eight hundred thirty-nine".