621798417 has 16 divisors (see below), whose sum is σ = 921607680. Its totient is φ = 414341136.

The previous prime is 621798407. The next prime is 621798449. The reversal of 621798417 is 714897126.

It is a happy number.

621798417 is a `hidden beast` number, since 62 + 179 + 8 + 417 = 666.

It is not a de Polignac number, because 621798417 - 2¹⁴ = 621782033 is a prime.

It is a super-3 number, since 3×621798417³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (621798407) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 78208 + ... + 85790.

It is an arithmetic number, because the mean of its divisors is an integer number (57600480).

Almost surely, 2^621798417 is an apocalyptic number.

It is an amenable number.

621798417 is a deficient number, since it is larger than the sum of its proper divisors (299809263).

621798417 is a wasteful number, since it uses less digits than its factorization.

621798417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10629 (or 10623 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 621798417 is about 24935.8861282289. The cubic root of 621798417 is about 853.5255721101.

The spelling of 621798417 in words is "six hundred twenty-one million, seven hundred ninety-eight thousand, four hundred seventeen".