626221 has 8 divisors (see below), whose sum is σ = 688320. Its totient is φ = 567072.

The previous prime is 626207. The next prime is 626239. The reversal of 626221 is 122626.

626221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 626221 - 2⁵ = 626189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

626221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (626201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (86040).

2⁶²⁶²²¹ is an apocalyptic number.

It is an amenable number.

626221 is a deficient number, since it is larger than the sum of its proper divisors (62099).

626221 is a wasteful number, since it uses less digits than its factorization.

626221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475.

The product of its digits is 288, while the sum is 19.

The square root of 626221 is about 791.3412664584. The cubic root of 626221 is about 85.5544379332.

Adding to 626221 its reverse (122626), we get a palindrome (748847).

The spelling of 626221 in words is "six hundred twenty-six thousand, two hundred twenty-one".