621966 has 16 divisors (see below), whose sum is σ = 1298304. Its totient is φ = 198264.

The previous prime is 621941. The next prime is 621983. The reversal of 621966 is 669126.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

621966 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 7 ways as a sum of consecutive naturals, for example, 2116 + ... + 2391.

It is an arithmetic number, because the mean of its divisors is an integer number (81144).

2⁶²¹⁹⁶⁶ is an apocalyptic number.

621966 is an abundant number, since it is smaller than the sum of its proper divisors (676338).

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

621966 is a wasteful number, since it uses less digits than its factorization.

621966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535.

The product of its digits is 3888, while the sum is 30.

The square root of 621966 is about 788.6482105476. The cubic root of 621966 is about 85.3602244080.

The spelling of 621966 in words is "six hundred twenty-one thousand, nine hundred sixty-six".