620439 has 4 divisors (see below), whose sum is σ = 827256. Its totient is φ = 413624.

The previous prime is 620437. The next prime is 620441. The reversal of 620439 is 934026.

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

It is an interprime number because it is at equal distance from previous prime (620437) and next prime (620441).

It is a cyclic number.

It is not a de Polignac number, because 620439 - 2¹ = 620437 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620437) 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 in 3 ways as a sum of consecutive naturals, for example, 103404 + ... + 103409.

It is an arithmetic number, because the mean of its divisors is an integer number (206814).

2⁶²⁰⁴³⁹ is an apocalyptic number.

620439 is a deficient number, since it is larger than the sum of its proper divisors (206817).

620439 is a wasteful number, since it uses less digits than its factorization.

620439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206816.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 620439 is about 787.6795033515. The cubic root of 620439 is about 85.2903106832.

The spelling of 620439 in words is "six hundred twenty thousand, four hundred thirty-nine".