621006 has 32 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 192864.

The previous prime is 620999. The next prime is 621007. The reversal of 621006 is 600126.

621006 = T₁₄₈ + T₁₄₉ + ... + T₁₉₀.

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 621006.

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

621006 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7441 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (41580).

2⁶²¹⁰⁰⁶ is an apocalyptic number.

621006 is an abundant number, since it is smaller than the sum of its proper divisors (709554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621006 is a wasteful number, since it uses less digits than its factorization.

621006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 621006 is about 788.0393391196. The cubic root of 621006 is about 85.3162841644.

It can be divided in two parts, 6 and 21006, that added together give a palindrome (21012).

The spelling of 621006 in words is "six hundred twenty-one thousand, six".