621806 has 8 divisors (see below), whose sum is σ = 955584. Its totient is φ = 303280.

The previous prime is 621799. The next prime is 621821. The reversal of 621806 is 608126.

It is a sphenic number, since it is the product of 3 distinct primes.

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 621806.

It is an unprimeable number.

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, 3710 + ... + 3873.

It is an arithmetic number, because the mean of its divisors is an integer number (119448).

2⁶²¹⁸⁰⁶ is an apocalyptic number.

621806 is a deficient number, since it is larger than the sum of its proper divisors (333778).

621806 is a wasteful number, since it uses less digits than its factorization.

621806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7626.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 621806 is about 788.5467646246. The cubic root of 621806 is about 85.3529041754.

It can be divided in two parts, 6 and 21806, that added together give a palindrome (21812).

The spelling of 621806 in words is "six hundred twenty-one thousand, eight hundred six".