621741 has 16 divisors (see below), whose sum is σ = 895104. Its totient is φ = 382464.

The previous prime is 621739. The next prime is 621749. The reversal of 621741 is 147126.

It is not a de Polignac number, because 621741 - 2¹ = 621739 is a prime.

It is a Curzon number.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3640 + ... + 3806.

It is an arithmetic number, because the mean of its divisors is an integer number (55944).

2⁶²¹⁷⁴¹ is an apocalyptic number.

It is an amenable number.

621741 is a deficient number, since it is larger than the sum of its proper divisors (273363).

621741 is a wasteful number, since it uses less digits than its factorization.

621741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260.

The product of its digits is 336, while the sum is 21.

The square root of 621741 is about 788.5055484903. The cubic root of 621741 is about 85.3499299723.

Adding to 621741 its reverse (147126), we get a palindrome (768867).

The spelling of 621741 in words is "six hundred twenty-one thousand, seven hundred forty-one".