621039 has 4 divisors (see below), whose sum is σ = 828056. Its totient is φ = 414024.

The previous prime is 621031. The next prime is 621043. The reversal of 621039 is 930126.

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

It is not a de Polignac number, because 621039 - 2³ = 621031 is a prime.

It is a D-number.

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 (621031) 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, 103504 + ... + 103509.

It is an arithmetic number, because the mean of its divisors is an integer number (207014).

2⁶²¹⁰³⁹ is an apocalyptic number.

621039 is a deficient number, since it is larger than the sum of its proper divisors (207017).

621039 is a wasteful number, since it uses less digits than its factorization.

621039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207016.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 621039 is about 788.0602768824. The cubic root of 621039 is about 85.3177953616.

The spelling of 621039 in words is "six hundred twenty-one thousand, thirty-nine".