621746 has 8 divisors (see below), whose sum is σ = 936684. Its totient is φ = 309520.

The previous prime is 621739. The next prime is 621749. The reversal of 621746 is 647126.

It can be written as a sum of positive squares in 2 ways, for example, as 546121 + 75625 = 739^2 + 275^2 .

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

It is a d-powerful number, because it can be written as 6⁶ + 2¹⁹ + 7² + 1 + 4⁶ + 6⁶ .

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (621749) by changing a digit.

621746 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56 + ... + 1116.

2⁶²¹⁷⁴⁶ is an apocalyptic number.

621746 is a deficient number, since it is larger than the sum of its proper divisors (314938).

621746 is a wasteful number, since it uses less digits than its factorization.

621746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356.

The product of its digits is 2016, while the sum is 26.

The square root of 621746 is about 788.5087190387. The cubic root of 621746 is about 85.3501587645.

The spelling of 621746 in words is "six hundred twenty-one thousand, seven hundred forty-six".