620539 has 4 divisors (see below), whose sum is σ = 622440. Its totient is φ = 618640.

The previous prime is 620531. The next prime is 620549. The reversal of 620539 is 935026.

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 620539 - 2³ = 620531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620531) 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, 322 + ... + 1159.

It is an arithmetic number, because the mean of its divisors is an integer number (155610).

2⁶²⁰⁵³⁹ is an apocalyptic number.

620539 is a deficient number, since it is larger than the sum of its proper divisors (1901).

620539 is a wasteful number, since it uses less digits than its factorization.

620539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 620539 is about 787.7429783883. The cubic root of 620539 is about 85.2948926931.

The spelling of 620539 in words is "six hundred twenty thousand, five hundred thirty-nine".