621005 has 16 divisors (see below), whose sum is σ = 929664. Its totient is φ = 386880.

The previous prime is 620999. The next prime is 621007. The reversal of 621005 is 500126.

It is not a de Polignac number, because 621005 - 2¹⁰ = 619981 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621005.

It is not an unprimeable number, because it can be changed into a prime (621007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422 + ... + 1191.

It is an arithmetic number, because the mean of its divisors is an integer number (58104).

2⁶²¹⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

621005 is a deficient number, since it is larger than the sum of its proper divisors (308659).

621005 is a wasteful number, since it uses less digits than its factorization.

621005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 621005 is about 788.0387046332. The cubic root of 621005 is about 85.3162383697.

The spelling of 621005 in words is "six hundred twenty-one thousand, five".